# 11-4 Areas of Regular Polygons and Composite Figures

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 1. In the figure, square ABDC is inscribed in F. Identify the center, a radius, an apothem, and a central angle of the polygon. Then find the measure of a central angle. Center: point F, radius:, apothem:, central angle: the measure of each central angle of square ABCD is, A square is a regular polygon with 4 sides. Thus, or 90. Find the area of each regular polygon. Round to the nearest tenth.. An equilateral triangle has three congruent sides. Draw an altitude and use the Pythagorean Theorem to find the height. Find the area of the triangle. Page 1

2 3. The polygon is a square. Form a right triangle. Use the Pythagorean Theorem to find x. Find the area of the square. 4. POOLS Kenton s job is to cover the community pool during fall and winter. Since the pool is in the shape of an octagon, he needs to find the area in order to have a custom cover made. If the pool has the dimensions shown at the right, what is the area of the pool? Since the polygon has 8 sides, the polygon can be divided into 8 congruent isosceles triangles, each with a base of 5 ft and a height of 6 ft. Find the area of one triangle. Page

3 4. POOLS Kenton s job is to cover the community pool during fall and winter. Since the pool is in the shape of an octagon, he needs to find the area in order to have a custom cover made. If the pool has the dimensions shown at the right, what is the area of the pool? Since the polygon has 8 sides, the polygon can be divided into 8 congruent isosceles triangles, each with a base of 5 ft and a height of 6 ft. Find the area of one triangle. Since there are 8 triangles, the area of the pool is 15 8 or 10 square feet. Find the area of each figure. Round to the nearest tenth if necessary Page 3

4 6. To find the area of the figure, subtract the area of the triangle from the area of the rectangle. Use the Pythagorean Theorem to find the height h of the isosceles triangle at the top of the figure. Area of the figure = Area of rectangle Area of triangle Therefore, the area of the figure is about 71.8 in. 7. BASKETBALL The basketball court in Jeff s school is painted as shown. Note: Art not drawn to scale. a. What area of the court is blue? Round to the nearest square foot. b. What area of the court is red? Round to the nearest square foot. Page 4 a. The small blue circle in the middle of the floor has a diameter of 6 feet so its radius is 3 feet. The blue sections on each end are the area of a rectangle minus the area of half the red circle. The rectangle has dimensions of 1 ft by

6 So, the area of the court that is red is about 311 ft. In each figure, a regular polygon is inscribed in a circle. Identify the center, a radius, an apothem, and a central angle of each polygon. Then find the measure of a central angle. 8. Center: point X, radius:, apothem:, central angle: the measure of each central angle of square RSTVW is, A square is a regular polygon with 4 sides. Thus, or Center: point R, radius:, apothem:, central angle: the measure of each central angle of square JKLMNP is, A square is a regular polygon with 4 sides. Thus, or 60. Find the area of each regular polygon. Round to the nearest tenth. 10. An equilateral triangle has three congruent sides. Draw an altitude and use the Pythagorean Theorem to find the height. Page 6

7 Center: point R, radius:, apothem:, central angle: 11-4the Areas of Regular andofcomposite Figures measure of each Polygons central angle square JKLMNP is, A square is a regular polygon with 4 sides. Thus, or 60. Find the area of each regular polygon. Round to the nearest tenth. 10. An equilateral triangle has three congruent sides. Draw an altitude and use the Pythagorean Theorem to find the height. Find the area of the triangle. 11. The formula for the area of a regular polygon is the apothem of the figure., so we need to determine the perimeter and the length of A regular pentagon has 5 congruent central angles, so the measure of central angle is or 7. Page 7

8 11. The formula for the area of a regular polygon is, so we need to determine the perimeter and the length of the apothem of the figure. A regular pentagon has 5 congruent central angles, so the measure of central angle is or 7. Apothem is the height of the isosceles triangle ABC. Triangles ACD and BCD are congruent, with ACD = BCD = 36. Use the Trigonometric ratios to find the side length and apothem of the polygon. Use the formula for the area of a regular polygon. 1. A regular hexagon has 6 congruent central angles that are a part of 6 congruent triangles, so the measure of the central angle is 60. esolutions Manual - Powered by=cognero Page 8

9 1. A regular hexagon has 6 congruent central angles that are a part of 6 congruent triangles, so the measure of the central angle is Apothem = 60. is the height of equilateral triangle ABC and it splits the triangle into two triangles. Use the Trigonometric ratio to find the side length of the polygon. AB = (AD), so AB = 8 tan A regular octagon has 8 congruent central angles, from 8 congruent triangles, so the measure of central angle is = 45. Page 9

10 13. A regular octagon has 8 congruent central angles, from 8 congruent triangles, so the measure of central angle is = 45. Apothem is the height of the isosceles triangle ABC and it splits the triangle into two congruent triangles. Use the trigonometric ratio to find the apothem of the polygon. 14. CARPETING Ignacio's family is getting new carpet in their family room, and they want to determine how much the project will cost. a. Use the floor plan shown to find the area to be carpeted. b. If the carpet costs \$4.86 per square yard, how much will the project cost? esolutions Manual - Powered by Cognero Page 10 a. The longer dotted red line divides the floor into two quadrilaterals. The quadrilateral formed on top will have four right angles, so it is a rectangle with a base of 4 feet. The height of the rectangle is 17 6 = 11 feet.the longer

11 14. CARPETING Ignacio's family is getting new carpet in their family room, and they want to determine how much the project will cost. a. Use the floor plan shown to find the area to be carpeted. b. If the carpet costs \$4.86 per square yard, how much will the project cost? a. The longer dotted red line divides the floor into two quadrilaterals. The quadrilateral formed on top will have four right angles, so it is a rectangle with a base of 4 feet. The height of the rectangle is 17 6 = 11 feet.the longer dotted red side and the bottom side (9 ft side) are both perpendicular to the shorter dotted red side (6 ft side) so they are parallel to each other. Since the quadrilateral on the bottom has two parallel sides, it is a trapezoid with a height of 6 feet and bases of length 9 feet and 4 feet (opposite sides of a rectangle are congruent). The area of the room will be the sum of the area of the rectangle and the area of the trapezoid. So, the area of the floor to be carpeted is 363 ft. b. At \$4.86 per yard, the project will cost: Find the area of each figure. Round to the nearest tenth if necessary. 15. Page 11

12 b. At \$4.86 per yard, the project will cost: Find the area of each figure. Round to the nearest tenth if necessary Page 1

13 Page 13

14 0. Use the Pythagorean Theorem to find h. 1. CRAFTS Latoya s greeting card company is making envelopes for a card from the pattern shown. a. Find the perimeter and area of the pattern? Round to the nearest tenth. b. If Latoya orders sheets of paper that are feet by 4 feet, how many envelopes can she make per sheet? a. To find the perimeter of the envelope, first use the Pythagorean theorem to find the missing sides of the isosceles triangle on the left. Page 14

15 11-4 Areas of Regular Polygons and Composite Figures a. To find the perimeter of the envelope, first use the Pythagorean theorem to find the missing sides of the isosceles triangle on the left. The base of the isosceles triangle is 5.5 inches, so the height will bisect the base into two segments that each have a length of.75 inches. So, each side of the isosceles triangle is about 3.83 inches long. Find the sum of the lengths of all the sides of the envelope pattern. Thus, the perimeter of the pattern is about 9.7 inches. The pattern can be divided into two rectangles and a triangle. The smaller rectangle is 5.5 inches by 4 inches. The large rectangle is 4 inches by inches. or 5.75 inches. The triangle has a base of 5.5 inches and a height of Area of pattern = Area of large rectangle) + Area of small rectangle) + Area of triangle Therefore, the area of the pattern is about 5.3 in. Page 15

16 Therefore, the area of the pattern is about 5.3 in. b. Dividing the area of the sheet of paper by the area of the pattern will not give us the number of envelopes per sheet. This does not allow for the paper lost due to the shape of the pattern. The number of envelopes per sheet will be determined by how many of the pattern shapes will fit on the paper. The maximum width of the pattern is inches. inches. The sheet of paper has a width of feet or so 4 patterns can be placed widthwise on the paper. The maximum length of the pattern is inches. inches. The sheet of paper has a length of 4 feet or 48 so 4 patterns can be placed lengthwise on the paper. Four patterns across by four patterns high will make a total of 4 4 or 16. So, Latoya can make 16 cards per sheet. Find the area of the shaded region formed by each circle and regular polygon. Round to the nearest tenth.. A regular pentagon has 5 congruent central angles, so the measure of central angle ACB is or 7. Apothem is the height of the isosceles triangle ABC, so it bisects ACB. Thus, m ACD = 36. Use the trigonometric ratios to find the side length and apothem of the polygon. Find AD. Find DC. Page 16

17 is the Polygons height of the triangle ABC, so it bisects ACB. Thus, m ACD = 36. Use the 11-4Apothem Areas of Regular andisosceles Composite Figures trigonometric ratios to find the side length and apothem of the polygon. Find AD. Find DC. ΔABC is an isosceles triangle, so AB = (AD) or 0 sin 36. Use the formula for finding the area of a regular polygon replacing a with DC and p with 5(AB). Use the formula for the area of a circle replacing r with AC. 3. First, find the area of the regular hexagon. A regular hexagon has 6 congruent central angles, so the measure of central angle ACB is or 60. Page 17

18 3. find area ofpolygons the regular hexagon. A regular hexagon has 6 congruent central angles, so the measure of 11-4First, Areas of the Regular and Composite Figures central angle ACB is or 60. Since AC = BC = 4, m CAB = m CBA and ΔABC is equilateral. Thus, AB = BC = 4 and the apothem is the height of an equilateral triangle ABC and bisects ACB. So, m BCD = 30. Use a trigonometric ratio to find the length of the. Use the formula for a regular polygon and replace a with DC and p with 6(AB) to find the area of the hexagon. Find the area of the circle by replacing r in the area formula with DC. Three of the six equal sections between the circle and the hexagon have been shaded, so the area of the shaded region is half the difference of the areas of the hexagon and the circle. The area of the shaded region is about 1.9 in. Page 18

19 The area of the shaded region is about 1.9 in. 4. First, find the area of the regular triangle. A regular triangle has 3 congruent central angles, so the measure of central angle ACB is or 10. Since all radii for a circle are equal, AC = BC and ΔABC is isosceles. The apothem is the height of ΔABC and will bisect and ACB. Thus, AD = 1 and m ACD = 60. Use trigonometric ratios to find the lengths of the and. Use the formula for a regular polygon and replace a with DC and p with 3(AB) to find the area of the triangle. Find the area of the circle by replacing r in the area formula with AC. Page 19

20 Use the formula for a regular polygon and replace a with DC and p with 3(AB) to find the area of the triangle. Find the area of the circle by replacing r in the area formula with AC. The area of the shaded region is the difference of the areas of the circle and the triangle. So, the area of the shaded region is about.5 ft. 5. CONSTRUCTION Find the area of the bathroom floor in the apartment floor plan. The total area of the bathroom floor is the sum of the areas of the vertical rectangle, the horizontal rectangle and the isosceles triangle shown. Page 0

21 11-4 Areas of Regular Polygons and Composite Figures The total area of the bathroom floor is the sum of the areas of the vertical rectangle, the horizontal rectangle and the isosceles triangle shown. Convert the given measures into inches and relabel the diagram. ft 11 in. = (1) + 11 or 35 in. 7 ft 8 in. = 7(1) + 8 or 9 in. 5 ft 4 in. = 5(1) + 4 or 64 in. ft 10 in. = (1) + 10 or 34 in. 5 ft 1 in. = 5(1) + 1 or 61 in. The area of the vertical rectangle is 35(9 34) or 030 in. The area of the horizontal rectangle is ( )34 or 364 in. An altitude of the isosceles triangle drawn from it s vertex to its base bisects the base and forms two right triangles. If the base of the triangle is or 96 in., then the length of the smaller leg of one of the right triangles is 0.5(96) or 48 inches. The length of the other leg, the height of the triangle, can be found using the Pythagorean Theorem. The area of the triangle is. The total area of the bathroom floor is about or in. Convert to square feet. Page 1

22 The area of the triangle is. The total area of the bathroom floor is about or in. Convert to square feet. Find the perimeter and area of the figure. Round to the nearest tenth, if necessary. 6. a regular hexagon with a side length of 1 centimeters A regular hexagon has 6 equal side lengths, so the perimeter is To find the area we first need to find the apothem. The length of the apothem is about a regular pentagon circumscribed about a circle with a radius of 8 millimeters Use trigonometry to determine the side length of the pentagon. Page

23 7. a regular pentagon circumscribed about a circle with a radius of 8 millimeters Use trigonometry to determine the side length of the pentagon. 8. a regular octagon inscribed in a circle with a radius of 5 inches A regular octagon has 8 congruent central angles, from 8 congruent triangles, so the measure of central angle is = 45. The apothem splits the triangle into two congruent triangles, cutting the central angle in half. The octagon is inscribed in a circle, so the radius of the circle is congruent to the radius of the octagon. Page 3

24 8. a regular octagon inscribed in a circle with a radius of 5 inches A regular octagon has 8 congruent central angles, from 8 congruent triangles, so the measure of central angle is = 45. The apothem splits the triangle into two congruent triangles, cutting the central angle in half. The octagon is inscribed in a circle, so the radius of the circle is congruent to the radius of the octagon. Use trigonometry to find the apothem and the length of each side of the octagon. The length of each side is 10 sin.5. The length of the apothem is 5 cos.5. Find the area of each shaded region. Round to the nearest tenth. Page 4

25 Find the area of each shaded region. Round to the nearest tenth. 9. To find the area of the shaded region, subtract the area of the semicircle and the area of the trapezoid from the area of the rectangle. 30. Page 5

26 30. To find the area of the figure, separate it into triangle MNO with a base of 6 units and a height of 3 units, two semicircles, and triangle MPO with a base of 6 units and a height of 1 unit. First, use the Distance Formula to find the diameter of one semicircle. So, the radius is. 31. Page 6

27 31. Using DH as a divider, we have two trapezoids, ACDH and GEDH. We need to find the areas of these and subtract the areas of the two triangles, ABC and GFE. 3. Find the total area of the shaded regions. Round to the nearest tenth. Find the area of the hexagon. A regular hexagon has 6 congruent triangles with 6 congruent central angles, so the measure of one central angle is = 60. Page 7

28 Find the area of the hexagon. A regular hexagon has 6 congruent triangles with 6 congruent central angles, so the measure of one central angle is = 60. Apothem polygon. is the height of an equilateral triangle ABC. Use the trigonometric ratios to find the apothem of the A regular pentagon has 5 congruent triangles with 5 congruent central angles, so the measure of each central angle is = 7. Find the area of a regular pentagon with a side length of 6 inches. The area of the shaded region is about 5 in. Page 8

29 The area of the shaded region is about 5 in. 33. CHANGING DIMENSIONS Calculate the area of an equilateral triangle with a perimeter of 3 inches. Calculate the areas of a square, a regular pentagon, and a regular hexagon with perimeters of 3 inches. How does the area of a regular polygon with a fixed perimeter change as the number of sides increases? Equilateral Triangle The perimeter of an equilateral triangle is 3 inches, so the length of each side of the triangle is 1 inch. Square The perimeter of the square is 3 inches, so the length of each side of the square is 0.75 inch. Regular pentagon The perimeter of the regular pentagon is 3 inches, the length of each side of the pentagon is 0.6 inch. Regular hexagon The perimeter of the regular hexagon is 3 inches, the length of each side of the pentagon is 0.5 inch. Page 9

30 hexagon 11-4Regular Areas of Regular Polygons and Composite Figures The perimeter of the regular hexagon is 3 inches, the length of each side of the pentagon is 0.5 inch. Sample answer: When the perimeter of a regular polygon is constant, as the number of sides increases, the area of the polygon increases. 34. MULTIPLE REPRESENTATIONS In this problem, you will investigate the areas of regular polygons inscribed in circles. a. GEOMETRIC Draw a circle with a radius of 1 unit and inscribe a square. Repeat twice, inscribing a regular pentagon and hexagon. b. ALGEBRAIC Use the inscribed regular polygons from part a to develop a formula for the area of an inscribed regular polygon in terms of angle measure x and number of sides n. c. TABULAR Use the formula you developed in part b to complete the table below. Round to the nearest hundredth. d. VERBAL Make a conjecture about the area of an inscribed regular polygon with a radius of 1 unit as the number of sides increases. a.use a compass to construct a circle with a radius of 1 unit. Use a protractor to draw a 90 central angle. Set the compass for the width of the two points of intersection of the circle and the angle. Use the compass to mark off two more points on the circle at that same width. Connect the four points to construct the inscribed square. Construct another circle and draw a 7 central angle. Mark off 3 more points using the width of the points of intersection and connect to form an inscribed regular pentagon. Then construct a third circle and draw a 60 angle. Mark off 4 additional points using the width of the points of intersection. Connect the points to construct an inscribed regular hexagon. b. The area of each inscribed regular polygon of n sides is n times the area of the isosceles triangle with legs of 1 unit created by the central angle that was drawn. Since all n triangles are congruent, the base angles of the triangle are each half of the interior angle of the regular polygon. So, for each regular polygon and the measure of the base angle is. Page 30

31 b. The area of each inscribed regular polygon of n sides is n times the area of the isosceles triangle with legs of 1 unit created by the central angle that was drawn. Since all n triangles are congruent, the base angles of the triangle are each half of the interior angle of the regular polygon. So, measure of the base angle is. for each regular polygon and the Use trigonometric ratios to find expressions for the height h and base s of the triangle in terms of x and then write an expression for the area of the triangle. For each inscribed regular polygon of n sides, there are n congruent isosceles triangles. Multiply to find the area of the regular polygon. c. To find the area of each inscribed regular polygon, first find the measure of its interior angles. For n = 4: For n = 5: esolutions For Manual n = 6: - Powered by Cognero Page 31

32 For n = 5: For n = 6: For n = 8: d. Sample answer: The area of a circle with radius 1 is or about As the number of sides of the polygon increases, the area of a polygon inscribed in a circle approaches the area of the circle or. 35. ERROR ANALYSIS Chloe and Flavio want to find the area of the hexagon shown. Is either of them correct? Explain your reasoning. Chloe sample answer: The measure of each angle of a regular hexagon is 10, so the segments from the center to each vertex form 60 angles. The triangles formed by the segments from the center to each vertex are equilateral, so each side of the hexagon is 11 in. The perimeter of the hexagon is 66 in. Using trigonometry, the length of the apothem is about 9.5 in. Putting the values into the formula for the area of a regular polygon and simplifying, the area is about. 36. CHALLENGE Using the map of Nevada shown, estimate the area of the state. Explain your reasoning. Page 3

34 37. OPEN ENDED Draw a pair of composite figures that have the same area. Make one composite figure out of a rectangle and a trapezoid, and make the other composite figure out of a triangle and a rectangle. Show the area of each basic figure. Have the areas of the figures each sum to a basic value, like 10 cm. Set the first rectangle equal to 6 cm with a base of 3 cm and a height of cm. Set the trapezoid below the rectangle, so the top base must be 3 cm. If the height of the trapezoid is 1 cm, then the bottom base must be 5 cm, so the area of the trapezoid is 0.5(1)(3 +5 ) = 4 cm. For the second figure, set the triangle to be a base and height of cm, with an area of cm. The rectangle should connect to the base of the triangle and by cm by 4 cm to have an area of 8 cm. 38. REASONING Is enough information provided to find the area of the shaded figure? If so, what is the area to the nearest square millimeter? If not, what additional information is needed? Explain. Yes; sample answer: You can draw a horizontal line across the top of the figure to complete the rectangle. Then subtract the area of the right triangle formed from the area of the rectangle to find the area of the figure. Use the Pythagorean Theorem to find the missing side length of the triangle. Page 34

35 38. REASONING Is enough information provided to find the area of the shaded figure? If so, what is the area to the nearest square millimeter? If not, what additional information is needed? Explain. Yes; sample answer: You can draw a horizontal line across the top of the figure to complete the rectangle. Then subtract the area of the right triangle formed from the area of the rectangle to find the area of the figure. Use the Pythagorean Theorem to find the missing side length of the triangle. So, the area of the shaded region is about 1147 mm. 39. WRITING IN MATH Explain how to find the area of a regular octagon if you are only given the distance from the center of the figure to a vertex. Sample answer: If you draw an apothem to the side of the octagon to form a right triangle with the side of the figure and the segment from the center to the vertex, you can use the triangle to find the apothem and the perimeter. Since the octagon is a regular octagon, the measure of each vertex is 135, so the angle formed by the side of the figure and the segment from the center to the vertex is Page 35

36 So, the area of the shaded region is about 1147 mm. 39. WRITING IN MATH Explain how to find the area of a regular octagon if you are only given the distance from the center of the figure to a vertex. Sample answer: If you draw an apothem to the side of the octagon to form a right triangle with the side of the figure and the segment from the center to the vertex, you can use the triangle to find the apothem and the perimeter. Since the octagon is a regular octagon, the measure of each vertex is 135, so the angle formed by the side of the figure and the segment from the center to the vertex is Using the sine ratio, the length of the apothem is the radius multiplied by sin Using the cosine ratio, one half of the length of a side is the radius multiplied by cos67.5, so the side is twice the radius multiplied by cos67.5. Find the perimeter by multiplying the length of the side by 8. Use the formula with the perimeter and apothem lengths you calculated. 40. Which polynomial best represents the area of the regular pentagon shown below? A B C D The given regular pentagon can be divided into five congruent triangles. The area of each triangle is. Page 36

37 Using the sine ratio, the length of the apothem is the radius multiplied by sin Using the cosine ratio, one half of the length of a side is the radius multiplied by cos67.5, so the side is twice the radius multiplied by cos67.5. Find the perimeter by multiplying the length of the side by 8. Use the formula lengths you calculated. with the perimeter and apothem 40. Which polynomial best represents the area of the regular pentagon shown below? A B C D The given regular pentagon can be divided into five congruent triangles. The area of each triangle is 41. What is. in radical form? F G H J So, the correct choice is F. 4. SHORT RESPONSE Find the area of the shaded figure in square inches. Round to the nearest tenth. Page 37

38 41. What is in radical form? F G H J So, the correct choice is F. 4. SHORT RESPONSE Find the area of the shaded figure in square inches. Round to the nearest tenth. Page 38 So, the area of the shaded region is (60) or 40 in.

39 So, the correct choice is F. 4. SHORT RESPONSE Find the area of the shaded figure in square inches. Round to the nearest tenth. So, the area of the shaded region is (60) or 40 in. 43. SAT/ACT If the, what is the value of tan θ? A B C D E Draw a right triangle to illustrate the problem using Find the length of the side opposite angle. using the Pythagorean Theorem. Page 39

40 So, the area of the shaded region is (60) or 40 in. 43. SAT/ACT If the, what is the value of tan θ? A B C D E Draw a right triangle to illustrate the problem using Find the length of the side opposite angle. using the Pythagorean Theorem. Use the definition to find the value of the tangent. Therefore, the correct choice is D. Find the indicated measure. Round to the nearest tenth. 44. The area of a circle is 95 square feet. Find the radius. 45. Find the area of a circle whose radius is 9 centimeters. Page 40

41 Therefore, the correct choice is D. Find the indicated measure. Round to the nearest tenth. 44. The area of a circle is 95 square feet. Find the radius. 45. Find the area of a circle whose radius is 9 centimeters. 46. The area of a circle is 56 square inches. Find the diameter. 47. Find the area of a circle whose diameter is 5 millimeters. Find the area of each trapezoid, rhombus, or kite. Page 41

42 Find the area of each trapezoid, rhombus, or kite are diameters of Then find its measure. O. Identify each arc as a major arc, minor arc, or semicircle of the circle. Page 4

43 are diameters of Then find its measure. O. Identify each arc as a major arc, minor arc, or semicircle of the circle. 51. is the corresponding arc for Therefore,, which is a diameter. is a semicircle and 5. is the shortest arc connecting the points E and B on It is a minor arc. 53. is the longest arc connecting the points A, and E on It is a major arc. Each pair of polygons is similar. Find x. 54. G corresponds with L (x 4) corresponds with 87 x = 91 Page 43

44 is the longest arc connecting the points A, and E on It is a major arc. Each pair of polygons is similar. Find x. 54. G corresponds with L (x 4) corresponds with 87 x = S corresponds with L x corresponds with 30 x = 30 Page 44

### 11-4 Areas of Regular Polygons and Composite Figures

1.In the figure, square ABDC is inscribed in F. Identify the center, a radius, an apothem, and a central angle of the polygon. Then find the measure of a central angle. SOLUTION: Center: point F, radius:,

### 10.1: Areas of Parallelograms and Triangles

10.1: Areas of Parallelograms and Triangles Important Vocabulary: By the end of this lesson, you should be able to define these terms: Base of a Parallelogram, Altitude of a Parallelogram, Height of a

### 10-4 Inscribed Angles. Find each measure. 1.

Find each measure. 1. 3. 2. intercepted arc. 30 Here, is a semi-circle. So, intercepted arc. So, 66 4. SCIENCE The diagram shows how light bends in a raindrop to make the colors of the rainbow. If, what

### Each pair of opposite sides of a parallelogram is congruent to each other.

Find the perimeter and area of each parallelogram or triangle. Round to the nearest tenth if necessary. 1. Use the Pythagorean Theorem to find the height h, of the parallelogram. 2. Each pair of opposite

### 11-1 Areas of Parallelograms and Triangles. Find the perimeter and area of each parallelogram or triangle. Round to the nearest tenth if necessary.

Find the perimeter and area of each parallelogram or triangle. Round to the nearest tenth if necessary. 2. 1. Use the Pythagorean Theorem to find the height h, of the parallelogram. Each pair of opposite

### as a fraction and as a decimal to the nearest hundredth.

Express each ratio as a fraction and as a decimal to the nearest hundredth. 1. sin A The sine of an angle is defined as the ratio of the opposite side to the hypotenuse. So, 2. tan C The tangent of an

### 11-2 Areas of Trapezoids, Rhombi, and Kites. Find the area of each trapezoid, rhombus, or kite. 1. SOLUTION: 2. SOLUTION: 3.

Find the area of each trapezoid, rhombus, or kite. 1. 2. 3. esolutions Manual - Powered by Cognero Page 1 4. OPEN ENDED Suki is doing fashion design at 4-H Club. Her first project is to make a simple A-line

### Solve each right triangle. Round side measures to the nearest tenth and angle measures to the nearest degree.

Solve each right triangle. Round side measures to the nearest tenth and angle measures to the nearest degree. 42. The sum of the measures of the angles of a triangle is 180. Therefore, The sine of an angle

### , where B is the area of the base and h is the height of the pyramid. The base

Find the volume of each pyramid. The volume of a pyramid is, where B is the area of the base and h is the height of the pyramid. The base of this pyramid is a right triangle with legs of 9 inches and 5

### Perimeter and area formulas for common geometric figures:

Lesson 10.1 10.: Perimeter and Area of Common Geometric Figures Focused Learning Target: I will be able to Solve problems involving perimeter and area of common geometric figures. Compute areas of rectangles,

### (a) 5 square units. (b) 12 square units. (c) 5 3 square units. 3 square units. (d) 6. (e) 16 square units

1. Find the area of parallelogram ACD shown below if the measures of segments A, C, and DE are 6 units, 2 units, and 1 unit respectively and AED is a right angle. (a) 5 square units (b) 12 square units

### PERIMETER AND AREA. In this unit, we will develop and apply the formulas for the perimeter and area of various two-dimensional figures.

PERIMETER AND AREA In this unit, we will develop and apply the formulas for the perimeter and area of various two-dimensional figures. Perimeter Perimeter The perimeter of a polygon, denoted by P, is the

### 12-2 Surface Areas of Prisms and Cylinders. 1. Find the lateral area of the prism. SOLUTION: ANSWER: in 2

1. Find the lateral area of the prism. 3. The base of the prism is a right triangle with the legs 8 ft and 6 ft long. Use the Pythagorean Theorem to find the length of the hypotenuse of the base. 112.5

### 13-3 Geometric Probability. 1. P(X is on ) SOLUTION: 2. P(X is on ) SOLUTION:

Point X is chosen at random on. Find the probability of each event. 1. P(X is on ) 2. P(X is on ) 3. CARDS In a game of cards, 43 cards are used, including one joker. Four players are each dealt 10 cards

### Area. Area Overview. Define: Area:

Define: Area: Area Overview Kite: Parallelogram: Rectangle: Rhombus: Square: Trapezoid: Postulates/Theorems: Every closed region has an area. If closed figures are congruent, then their areas are equal.

### Chapter 7 Quiz. (1.) Which type of unit can be used to measure the area of a region centimeter, square centimeter, or cubic centimeter?

Chapter Quiz Section.1 Area and Initial Postulates (1.) Which type of unit can be used to measure the area of a region centimeter, square centimeter, or cubic centimeter? (.) TRUE or FALSE: If two plane

### Conjectures. Chapter 2. Chapter 3

Conjectures Chapter 2 C-1 Linear Pair Conjecture If two angles form a linear pair, then the measures of the angles add up to 180. (Lesson 2.5) C-2 Vertical Angles Conjecture If two angles are vertical

### 10.1 Areas of Quadrilaterals and triangles

10.1 Areas of Quadrilaterals and triangles BASE AND HEIGHT MUST FORM A RIGHT ANGLE!! Draw the diagram, write the formula and SHOW YOUR WORK! FIND THE AREA OF THE FOLLOWING:. A rectangle with one side of

### Conjectures for Geometry for Math 70 By I. L. Tse

Conjectures for Geometry for Math 70 By I. L. Tse Chapter Conjectures 1. Linear Pair Conjecture: If two angles form a linear pair, then the measure of the angles add up to 180. Vertical Angle Conjecture:

### Geometry Unit 7 (Textbook Chapter 9) Solving a right triangle: Find all missing sides and all missing angles

Geometry Unit 7 (Textbook Chapter 9) Name Objective 1: Right Triangles and Pythagorean Theorem In many geometry problems, it is necessary to find a missing side or a missing angle of a right triangle.

### Review for Final - Geometry B

Review for Final - Geometry B Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A model is made of a car. The car is 4 meters long and the model is 7 centimeters

### Integrated Algebra: Geometry

Integrated Algebra: Geometry Topics of Study: o Perimeter and Circumference o Area Shaded Area Composite Area o Volume o Surface Area o Relative Error Links to Useful Websites & Videos: o Perimeter and

### Name: Class: Date: Geometry Chapter 3 Review

Name: Class: Date: ID: A Geometry Chapter 3 Review. 1. The area of a rectangular field is 6800 square meters. If the width of the field is 80 meters, what is the perimeter of the field? Draw a diagram

### 12-4 Volumes of Prisms and Cylinders. Find the volume of each prism. The volume V of a prism is V = Bh, where B is the area of a base and h

Find the volume of each prism. The volume V of a prism is V = Bh, where B is the area of a base and h The volume is 108 cm 3. The volume V of a prism is V = Bh, where B is the area of a base and h the

### Working in 2 & 3 dimensions Revision Guide

Tips for Revising Working in 2 & 3 dimensions Make sure you know what you will be tested on. The main topics are listed below. The examples show you what to do. List the topics and plan a revision timetable.

### Applications for Triangles

Not drawn to scale Applications for Triangles 1. 36 in. 40 in. 33 in. 1188 in. 2 69 in. 2 138 in. 2 1440 in. 2 2. 188 in. 2 278 in. 2 322 in. 2 none of these Find the area of a parallelogram with the given

### 1. A person has 78 feet of fencing to make a rectangular garden. What dimensions will use all the fencing with the greatest area?

1. A person has 78 feet of fencing to make a rectangular garden. What dimensions will use all the fencing with the greatest area? (a) 20 ft x 19 ft (b) 21 ft x 18 ft (c) 22 ft x 17 ft 2. Which conditional

### GEOMETRY 101* EVERYTHING YOU NEED TO KNOW ABOUT GEOMETRY TO PASS THE GHSGT!

GEOMETRY 101* EVERYTHING YOU NEED TO KNOW ABOUT GEOMETRY TO PASS THE GHSGT! FINDING THE DISTANCE BETWEEN TWO POINTS DISTANCE FORMULA- (x₂-x₁)²+(y₂-y₁)² Find the distance between the points ( -3,2) and

### Postulate 17 The area of a square is the square of the length of a. Postulate 18 If two figures are congruent, then they have the same.

Chapter 11: Areas of Plane Figures (page 422) 11-1: Areas of Rectangles (page 423) Rectangle Rectangular Region Area is measured in units. Postulate 17 The area of a square is the square of the length

### 3. If AC = 12, CD = 9 and BE = 3, find the area of trapezoid BCDE. (Mathcounts Handbooks)

EXERCISES: Triangles 1 1. The perimeter of an equilateral triangle is units. How many units are in the length 27 of one side? (Mathcounts Competitions) 2. In the figure shown, AC = 4, CE = 5, DE = 3, and

### Line AB (no Endpoints) Ray with Endpoint A. Line Segments with Endpoints A and B. Angle is formed by TWO Rays with a common Endpoint.

Section 8 1 Lines and Angles Point is a specific location in space.. Line is a straight path (infinite number of points). Line Segment is part of a line between TWO points. Ray is part of the line that

### 7-1 Ratios and Proportions

1. PETS Out of a survey of 1000 households, 460 had at least one dog or cat as a pet. What is the ratio of pet owners to households? The ratio of per owners to households is 23:50. 2. SPORTS Thirty girls

### CONJECTURES - Discovering Geometry. Chapter 2

CONJECTURES - Discovering Geometry Chapter C-1 Linear Pair Conjecture - If two angles form a linear pair, then the measures of the angles add up to 180. C- Vertical Angles Conjecture - If two angles are

### Definitions, Postulates and Theorems

Definitions, s and s Name: Definitions Complementary Angles Two angles whose measures have a sum of 90 o Supplementary Angles Two angles whose measures have a sum of 180 o A statement that can be proven

### 7.1 Apply the Pythagorean Theorem

7.1 Apply the Pythagorean Theorem Obj.: Find side lengths in right triangles. Key Vocabulary Pythagorean triple - A Pythagorean triple is a set of three positive integers a, b, and c that satisfy the equation

### 12-8 Congruent and Similar Solids

Determine whether each pair of solids is similar, congruent, or neither. If the solids are similar, state the scale factor. 3. Two similar cylinders have radii of 15 inches and 6 inches. What is the ratio

### Content Area: GEOMETRY Grade 9 th Quarter 1 st Curso Serie Unidade

Content Area: GEOMETRY Grade 9 th Quarter 1 st Curso Serie Unidade Standards/Content Padrões / Conteúdo Learning Objectives Objetivos de Aprendizado Vocabulary Vocabulário Assessments Avaliações Resources

### Geometry Regents Review

Name: Class: Date: Geometry Regents Review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. If MNP VWX and PM is the shortest side of MNP, what is the shortest

### 12-8 Congruent and Similar Solids

Determine whether each pair of solids is similar, congruent, or neither. If the solids are similar, state the scale factor. Ratio of radii: Ratio of heights: The ratios of the corresponding measures are

### 2006 Geometry Form A Page 1

2006 Geometry Form Page 1 1. he hypotenuse of a right triangle is 12" long, and one of the acute angles measures 30 degrees. he length of the shorter leg must be: () 4 3 inches () 6 3 inches () 5 inches

### Unit 7: Right Triangles and Trigonometry Lesson 7.1 Use Inequalities in a Triangle Lesson 5.5 from textbook

Unit 7: Right Triangles and Trigonometry Lesson 7.1 Use Inequalities in a Triangle Lesson 5.5 from textbook Objectives Use the triangle measurements to decide which side is longest and which angle is largest.

### 12-6 Surface Area and Volumes of Spheres. Find the surface area of each sphere or hemisphere. Round to the nearest tenth. SOLUTION: ANSWER: 1017.

Find the surface area of each sphere or hemisphere. Round to the nearest tenth. 3. sphere: area of great circle = 36π yd 2 We know that the area of a great circle is r.. Find 1. Now find the surface area.

### 43 Perimeter and Area

43 Perimeter and Area Perimeters of figures are encountered in real life situations. For example, one might want to know what length of fence will enclose a rectangular field. In this section we will study

### Unit 7 Syllabus: Area

Date Period Day Topic Unit 7 Syllabus: Area 1 Areas of Parallelograms and Triangles 2 Areas of Trapezoids, Rhombuses and Kites 3 Areas of Regular Polygons 4 Quiz 5 Perimeters and Areas of Similar Figures

Unit 6: POLYGONS Are these polygons? Justify your answer by explaining WHY or WHY NOT??? a) b) c) Yes or No Why/Why not? Yes or No Why/Why not? Yes or No Why/Why not? a) What is a CONCAVE polygon? Use

### Algebra Geometry Glossary. 90 angle

lgebra Geometry Glossary 1) acute angle an angle less than 90 acute angle 90 angle 2) acute triangle a triangle where all angles are less than 90 3) adjacent angles angles that share a common leg Example:

### 12-4 Volumes of Prisms and Cylinders. Find the volume of each prism.

Find the volume of each prism. 3. the oblique rectangular prism shown at the right 1. The volume V of a prism is V = Bh, where B is the area of a base and h is the height of the prism. If two solids have

### Unit 3: Triangle Bisectors and Quadrilaterals

Unit 3: Triangle Bisectors and Quadrilaterals Unit Objectives Identify triangle bisectors Compare measurements of a triangle Utilize the triangle inequality theorem Classify Polygons Apply the properties

### Centroid: The point of intersection of the three medians of a triangle. Centroid

Vocabulary Words Acute Triangles: A triangle with all acute angles. Examples 80 50 50 Angle: A figure formed by two noncollinear rays that have a common endpoint and are not opposite rays. Angle Bisector:

### Objectives. Cabri Jr. Tools

Activity 24 Angle Bisectors and Medians of Quadrilaterals Objectives To investigate the properties of quadrilaterals formed by angle bisectors of a given quadrilateral To investigate the properties of

### Geometry Honors: Extending 2 Dimensions into 3 Dimensions. Unit Overview. Student Focus. Semester 2, Unit 5: Activity 30. Resources: Online Resources:

Geometry Honors: Extending 2 Dimensions into 3 Dimensions Semester 2, Unit 5: Activity 30 Resources: SpringBoard- Geometry Online Resources: Geometry Springboard Text Unit Overview In this unit students

### Topics Covered on Geometry Placement Exam

Topics Covered on Geometry Placement Exam - Use segments and congruence - Use midpoint and distance formulas - Measure and classify angles - Describe angle pair relationships - Use parallel lines and transversals

### Solution Guide for Chapter 6: The Geometry of Right Triangles

Solution Guide for Chapter 6: The Geometry of Right Triangles 6. THE THEOREM OF PYTHAGORAS E-. Another demonstration: (a) Each triangle has area ( ). ab, so the sum of the areas of the triangles is 4 ab

### Law of Cosines. If the included angle is a right angle then the Law of Cosines is the same as the Pythagorean Theorem.

Law of Cosines In the previous section, we learned how the Law of Sines could be used to solve oblique triangles in three different situations () where a side and two angles (SAA) were known, () where

### Sum of the interior angles of a n-sided Polygon = (n-2) 180

5.1 Interior angles of a polygon Sides 3 4 5 6 n Number of Triangles 1 Sum of interiorangles 180 Sum of the interior angles of a n-sided Polygon = (n-2) 180 What you need to know: How to use the formula

### The scale factor between the blue triangle and the green triangle is

For each pair of similar figures, find the area of the green figure 1 SOLUTION: The scale factor between the blue diamond and the green diamond is 2 The area of the green diamond is 9 yd 2 SOLUTION: The

### are radii of the same circle. So, they are equal in length. Therefore, DN = 8 cm.

For Exercises 1 4, refer to. 1. Name the circle. The center of the circle is N. So, the circle is 2. Identify each. a. a chord b. a diameter c. a radius a. A chord is a segment with endpoints on the circle.

### 1. An isosceles trapezoid does not have perpendicular diagonals, and a rectangle and a rhombus are both parallelograms.

Quadrilaterals - Answers 1. A 2. C 3. A 4. C 5. C 6. B 7. B 8. B 9. B 10. C 11. D 12. B 13. A 14. C 15. D Quadrilaterals - Explanations 1. An isosceles trapezoid does not have perpendicular diagonals,

### BASIC GEOMETRY GLOSSARY

BASIC GEOMETRY GLOSSARY Acute angle An angle that measures between 0 and 90. Examples: Acute triangle A triangle in which each angle is an acute angle. Adjacent angles Two angles next to each other that

### Study Guide. 6.g.1 Find the area of triangles, quadrilaterals, and other polygons. Note: Figure is not drawn to scale.

Study Guide Name Test date 6.g.1 Find the area of triangles, quadrilaterals, and other polygons. 1. Note: Figure is not drawn to scale. If x = 14 units and h = 6 units, then what is the area of the triangle

### A. Areas of Parallelograms 1. If a parallelogram has an area of A square units, a base of b units, and a height of h units, then A = bh.

Geometry - Areas of Parallelograms A. Areas of Parallelograms. If a parallelogram has an area of A square units, a base of b units, and a height of h units, then A = bh. A B Ex: See how VDFA V CGB so rectangle

### Test to see if ΔFEG is a right triangle.

1. Copy the figure shown, and draw the common tangents. If no common tangent exists, state no common tangent. Every tangent drawn to the small circle will intersect the larger circle in two points. Every

### 10-1. Areas of Parallelograms and Triangles. Vocabulary. Review. Vocabulary Builder. Use Your Vocabulary

- Areas of Parallelograms and Triangles Vocabulary Review The diagram below shows the different types of parallelograms. Parallelogram Rhombus Rectangle Square Underline the correct word to complete each

### Identifying Triangles 5.5

Identifying Triangles 5.5 Name Date Directions: Identify the name of each triangle below. If the triangle has more than one name, use all names. 1. 5. 2. 6. 3. 7. 4. 8. 47 Answer Key Pages 19 and 20 Name

### Chapter 8 Geometry We will discuss following concepts in this chapter.

Mat College Mathematics Updated on Nov 5, 009 Chapter 8 Geometry We will discuss following concepts in this chapter. Two Dimensional Geometry: Straight lines (parallel and perpendicular), Rays, Angles

### Chapters 6 and 7 Notes: Circles, Locus and Concurrence

Chapters 6 and 7 Notes: Circles, Locus and Concurrence IMPORTANT TERMS AND DEFINITIONS A circle is the set of all points in a plane that are at a fixed distance from a given point known as the center of

### 2006 ACTM STATE GEOMETRY EXAM

2006 TM STT GOMTRY XM In each of the following you are to choose the best (most correct) answer and mark the corresponding letter on the answer sheet provided. The figures are not necessarily drawn to

### Overview Mathematical Practices Congruence

Overview Mathematical Practices Congruence 1. Make sense of problems and persevere in Experiment with transformations in the plane. solving them. Understand congruence in terms of rigid motions. 2. Reason

### Chapter 11 Resource Masters

Chapter 11 Resource Masters 11-1 Study Guide and Intervention Areas of Parallelograms and Triangles Areas of Parallelograms Any side of a parallelogram can be called a base. The height of a parallelogram

### Geometry Chapter 12. Volume. Surface Area. Similar shapes ratio area & volume

Geometry Chapter 12 Volume Surface Area Similar shapes ratio area & volume Date Due Section Topics Assignment Written Exercises 12.1 Prisms Altitude Lateral Faces/Edges Right vs. Oblique Cylinders 12.3

### Dyffryn School Ysgol Y Dyffryn Mathematics Faculty

Dyffryn School Ysgol Y Dyffryn Mathematics Faculty Formulae and Facts Booklet Higher Tier Number Facts Sum This means add. Difference This means take away. Product This means multiply. Share This means

### Honors Geometry Final Exam Study Guide

2011-2012 Honors Geometry Final Exam Study Guide Multiple Choice Identify the choice that best completes the statement or answers the question. 1. In each pair of triangles, parts are congruent as marked.

### 8-1 Geometric Mean. or Find the geometric mean between each pair of numbers and 20. similar triangles in the figure.

8-1 Geometric Mean or 24.5 Find the geometric mean between each pair of numbers. 1. 5 and 20 4. Write a similarity statement identifying the three similar triangles in the figure. numbers a and b is given

# 30-60 right triangle, 441-442, 684 A Absolute value, 59 Acute angle, 77, 669 Acute triangle, 178 Addition Property of Equality, 86 Addition Property of Inequality, 258 Adjacent angle, 109, 669 Adjacent

### Sect 8.3 Quadrilaterals, Perimeter, and Area

186 Sect 8.3 Quadrilaterals, Perimeter, and Area Objective a: Quadrilaterals Parallelogram Rectangle Square Rhombus Trapezoid A B E F I J M N Q R C D AB CD AC BD AB = CD AC = BD m A = m D m B = m C G H

### 11-5 Areas of Similar Figures. For each pair of similar figures, find the area of the green figure. SOLUTION:

The area of the green diamond 9 yd F each pair of similar figures, find the area of the green figure The scale fact between the blue triangle and the 1 green triangle The scale fact between the blue diamond

### of surface, 569-571, 576-577, 578-581 of triangle, 548 Associative Property of addition, 12, 331 of multiplication, 18, 433

Absolute Value and arithmetic, 730-733 defined, 730 Acute angle, 477 Acute triangle, 497 Addend, 12 Addition associative property of, (see Commutative Property) carrying in, 11, 92 commutative property

### Geometry Chapter 9 Extending Perimeter, Circumference, and Area

Geometry Chapter 9 Extending Perimeter, Circumference, and Area Lesson 1 Developing Formulas for Triangles and Quadrilaterals Learning Targets LT9-1: Solve problems involving the perimeter and area of

### Geometry Chapter 9 Extending Perimeter, Circumference, and Area

Geometry Chapter 9 Extending Perimeter, Circumference, and Area Lesson 1 Developing Formulas for Triangles and Quadrilaterals Learning Target (LT-1) Solve problems involving the perimeter and area of triangles

### Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.

Name: Class: Date: ID: A Q3 Geometry Review Multiple Choice Identify the choice that best completes the statement or answers the question. Graph the image of each figure under a translation by the given

### Signs, Signs, Every Place There Are Signs! Area of Regular Polygons p. 171 Boundary Lines Area of Parallelograms and Triangles p.

C H A P T E R Perimeter and Area Regatta is another word for boat race. In sailing regattas, sailboats compete on courses defined by marks or buoys. These courses often start and end at the same mark,

### CK-12 Geometry: Parts of Circles and Tangent Lines

CK-12 Geometry: Parts of Circles and Tangent Lines Learning Objectives Define circle, center, radius, diameter, chord, tangent, and secant of a circle. Explore the properties of tangent lines and circles.

### Name: Perimeter and area November 18, 2013

1. How many differently shaped rectangles with whole number sides could have an area of 360? 5. If a rectangle s length and width are both doubled, by what percent is the rectangle s area increased? 2.

### A. 3y = -2x + 1. y = x + 3. y = x - 3. D. 2y = 3x + 3

Name: Geometry Regents Prep Spring 2010 Assignment 1. Which is an equation of the line that passes through the point (1, 4) and has a slope of 3? A. y = 3x + 4 B. y = x + 4 C. y = 3x - 1 D. y = 3x + 1

### Section 7.1 Solving Right Triangles

Section 7.1 Solving Right Triangles Note that a calculator will be needed for most of the problems we will do in class. Test problems will involve angles for which no calculator is needed (e.g., 30, 45,

### Teacher Page Key. Geometry / Day # 13 Composite Figures 45 Min.

Teacher Page Key Geometry / Day # 13 Composite Figures 45 Min. 9-1.G.1. Find the area and perimeter of a geometric figure composed of a combination of two or more rectangles, triangles, and/or semicircles

### 0810ge. Geometry Regents Exam 0810

0810ge 1 In the diagram below, ABC XYZ. 3 In the diagram below, the vertices of DEF are the midpoints of the sides of equilateral triangle ABC, and the perimeter of ABC is 36 cm. Which two statements identify

### MATH 139 FINAL EXAM REVIEW PROBLEMS

MTH 139 FINL EXM REVIEW PROLEMS ring a protractor, compass and ruler. Note: This is NOT a practice exam. It is a collection of problems to help you review some of the material for the exam and to practice

### FS Geometry EOC Review

MAFS.912.G-C.1.1 Dilation of a Line: Center on the Line In the figure, points A, B, and C are collinear. http://www.cpalms.org/public/previewresource/preview/72776 1. Graph the images of points A, B, and

### CSU Fresno Problem Solving Session. Geometry, 17 March 2012

CSU Fresno Problem Solving Session Problem Solving Sessions website: http://zimmer.csufresno.edu/ mnogin/mfd-prep.html Math Field Day date: Saturday, April 21, 2012 Math Field Day website: http://www.csufresno.edu/math/news

### 12-1 Representations of Three-Dimensional Figures

Connect the dots on the isometric dot paper to represent the edges of the solid. Shade the tops of 12-1 Representations of Three-Dimensional Figures Use isometric dot paper to sketch each prism. 1. triangular

### 2 feet Opposite sides of a rectangle are equal. All sides of a square are equal. 2 X 3 = 6 meters = 18 meters

GEOMETRY Vocabulary 1. Adjacent: Next to each other. Side by side. 2. Angle: A figure formed by two straight line sides that have a common end point. A. Acute angle: Angle that is less than 90 degree.

### LEVEL G, SKILL 1. Answers Be sure to show all work.. Leave answers in terms of ϖ where applicable.

Name LEVEL G, SKILL 1 Class Be sure to show all work.. Leave answers in terms of ϖ where applicable. 1. What is the area of a triangle with a base of 4 cm and a height of 6 cm? 2. What is the sum of the

### Solutions Section J: Perimeter and Area

Solutions Section J: Perimeter and Area 1. The 6 by 10 rectangle below has semi-circles attached on each end. 6 10 a) Find the perimeter of (the distance around) the figure above. b) Find the area enclosed

### 9-1 Similar Right Triangles (Day 1) 1. Review:

9-1 Similar Right Triangles (Day 1) 1. Review: Given: ACB is right and AB CD Prove: ΔADC ~ ΔACB ~ ΔCDB. Statement Reason 2. In the diagram in #1, suppose AD = 27 and BD = 3. Find CD. (You may find it helps

### Chapter 11. Areas of Plane Figures You MUST draw diagrams and show formulas for every applicable homework problem!

Chapter 11 Areas of Plane Figures You MUST draw diagrams and show formulas for every applicable homework problem! Objectives A. Use the terms defined in the chapter correctly. B. Properly use and interpret

### Chapter 8. Right Triangles

Chapter 8 Right Triangles Objectives A. Use the terms defined in the chapter correctly. B. Properly use and interpret the symbols for the terms and concepts in this chapter. C. Appropriately apply the

### 39 Symmetry of Plane Figures

39 Symmetry of Plane Figures In this section, we are interested in the symmetric properties of plane figures. By a symmetry of a plane figure we mean a motion of the plane that moves the figure so that