# Parallel and Perpendicular. We show a small box in one of the angles to show that the lines are perpendicular.

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1 CONDENSED L E S S O N. Parallel and Perpendicular In this lesson you will learn the meaning of parallel and perpendicular discover how the slopes of parallel and perpendicular lines are related use slopes to help classify figures in the coordinate plane Parallel lines are lines in the same plane that never intersect. Perpendicular lines are lines in the same plane that intersect at a right angle. We show a small box in one of the angles to show that the lines are perpendicular. Investigation: Slopes The opposite sides of a rectangle are parallel, and the adjacent sides are perpendicular. By examining rectangles drawn on a coordinate grid, you can discover how the slopes of parallel and perpendicular lines are related. Step gives the vertices of four rectangles. Here is the rectangle with the vertices given in part a. Find the slope of each side of the rectangle. You should get these results. (Note: The notation B means segment B. ) Slope of D : 7 9 Slope of BC : 7 9 Slope of B : 9 7 Slope of DC : 9 7 Notice that the slopes of the parallel sides D and BC are the same and that the slopes of the parallel sides B and DC are the same. D C 0 y 0 B 0 x Recall that, to find the reciprocal of a fraction, you exchange the numerator and the denominator. For example, the reciprocal of 4 is 4. The product of a number and its reciprocal is. Look at the slopes of the perpendicular sides D and DC. The slope of DC is the negative reciprocal of the slope of D. The product of the slopes, 7 9 and 9, 7 is. You ll find this same relationship for any pair of perpendicular sides of the rectangle. (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 4

2 Previous Lesson. Parallel and Perpendicular (continued) Now, choose another set of vertices from Step, and find the slopes of the sides of the rectangle. You should find the same relationships among the slopes of the sides. In fact, any two parallel lines have the same slope, and any two perpendicular lines have slopes that are negative reciprocals. right triangle has one right angle. The sides that form the right angle are called legs, and the side opposite the right angle is called the hypotenuse. If a triangle is drawn on a coordinate grid, you can use what you know about slopes of perpendicular lines to determine if it is a right triangle. This is demonstrated in Example in your book. Here is another example. Leg Hypotenuse Leg EXMPLE Decide whether this triangle is a right triangle. y 4 B 4 4 x 4 C Solution This triangle has vertices (, ), B(, ), and C(, 4). ngles B and C are clearly not right angles, but angle might be. To check, find the slopes of B and C : ( ) Slope B : 4 ( ) Slope C : 4 ( ) ( ) 6 The slopes, and, are not negative reciprocals, so the sides are not perpendicular. Because none of the angles are right angles, the triangle is not a right triangle. trapezoid is a quadrilateral with one pair of opposite sides that are parallel and one pair of opposite sides that are not parallel. trapezoid with a right angle is a right trapezoid. Every right trapezoid must have two right angles because opposite sides are parallel. Here are some examples of trapezoids. To determine whether a quadrilateral drawn on a coordinate grid is a trapezoid that is not also a parallelogram, you need to check that two of the opposites sides have the same slope and the other two opposite sides have different slopes. To decide whether the trapezoid is a right trapezoid, you also need to check that the slopes of two adjacent sides are negative reciprocals. This is illustrated in Example B in your book. 44 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

3 CONDENSED L E S S O N. Finding the Midpoint Previous In this lesson you will discover the midpoint formula use the midpoint formula to find midpoints of segments write equations for medians of triangles and perpendicular bisectors of segments The midpoint of a line segment is the middle point that is, the point halfway between the endpoints. The text on page 588 of your book explains that finding midpoints is necessary for drawing the median of a triangle and the perpendicular bisector of a line segment. Read this text carefully. Investigation: In the Middle This triangle has vertices (, ), B(5, ), and C(5, 7). The midpoint of B is (, ). Notice that the x-coordinate of this point is the average of the x-coordinates of the endpoints. The midpoint of BC is (5, 4.5). Notice that the y-coordinate of this point is the average of the y-coordinates of the endpoints. The midpoint of C is (, 4.5). Notice that the x-coordinate of this point is the average of the x-coordinates of the endpoints and that the y-coordinate is the average of the y-coordinates of the endpoints. y 8 C 6 4 B x Segment DE has endpoints D(, 5) and E(7, ). The midpoint of DE is (4.5, 8). The x-coordinate of this point is the average of the x-coordinates of the endpoints, and the y-coordinate is the average of the y-coordinates of the endpoints. y 0 E Use the idea of averaging the coordinates of the endpoints to find the midpoint of the segment between each pair of points. For Step 8, you should get these results. 8 6 Midpoint (4.5, 8) a. midpoint of FG : (.5, 8) b. midpoint of HJ : (, ) 4 D x The technique used in the investigation to find the midpoint of a segment is known as the midpoint formula. If the endpoints of a segment have coordinates (x, y ) and (x, y ), the midpoint of the segment has coordinates x x, y y (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 45

4 Previous Lesson. Finding the Midpoint (continued) The example in your book shows how to find equations for a median of a triangle and the perpendicular bisector of one of its sides. Below is another example. EXMPLE This triangle has vertices (, ), B(, 4), and C(, ). y 4 B 4 4 x 4 C a. Write the equation of the median from vertex. b. Write the equation of the perpendicular bisector of BC. Solution a. The median from vertex goes to the midpoint of BC. So, find the midpoint of BC. midpoint of BC :, 4 ( ) (.5, 0.5) Now, use the coordinates of vertex and the midpoint to find the slope of the median slope of median:.5 ( ) Use the coordinates of the midpoint and the slope to find the equation. y 0.5 (x 7.5) b. The perpendicular bisector of BC goes through the midpoint of BC, which is (.5, 0.5) and is perpendicular to BC. The slope of BC is 4, or 7, so the slope of the perpendicular bisector is the negative reciprocal of 7, or. 7 Write the equation, using this slope and the coordinates of the midpoint. y 0.5 (x 7.5) 46 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

5 CONDENSED L E S S O N. Previous Squares, Right Triangles, and reas In this lesson you will find the areas of polygons drawn on a grid find the area and side length of squares drawn on a grid draw a segment of a given length by drawing a square with the square of the length as area Example in your book shows you how to find the length of a rectangle and a right triangle. Example B demonstrates how to find the area of a tilted square by drawing a square with horizontal and vertical sides around it. Read both examples carefully. Investigation: What s My rea? Step Find the area of each figure in Step. You should get these results. a. square unit b. 5 square units c. 6 square units d. square units e. 8 square units f. square units g. 6 square units h. 6 square units i. 0.5 square units j. 8 square units There are many ways to find the areas of these figures. One useful technique involves drawing a rectangle around the figure. This drawing shows a rectangle around figure i. To find the area of the figure, subtract the sum of the areas of the triangles from the area of the rectangle. rea of figure i 6 (.5 ) Steps 4 If you know the area of a square, you can find the side length by taking the square root. For example, the square labeled d in Step has an area of square units, so the length of each side is units. The square labeled e in Step has an area of 8 square units, so the length of each side is 8 units. Look at the squares in Step. The first square has an area of 9 and a side length of. To find the area of the second square, surround it by a square with horizontal and vertical sides as shown here. The area is 0 square units, so the side length is 0 units..5.5 rea 6 4(.5) square units (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 47

6 Previous Lesson. Squares, Right Triangles, and reas (continued) Step 4 shows the smallest and largest squares that can be drawn on a 5-by-5 grid. Draw at least five other squares, and find the area and side length of each. Here are three examples. rea 4 square units Side length units rea square units Side length units rea 5 square units Side length 5 units Because 0 is equal to a decimal whose digits go on forever, it may surprise you that you can draw a segment with a length of exactly 0 units. You just need to draw a square with an area of 0 square units; each side will have a length of 0 units. The example below shows you how to draw a segment with a length of 7 units. EXMPLE Draw a line segment that is exactly 7 units long. Solution To draw a segment with a length of 7 units, first draw a square with an area of 7 square units. Because 7 is not a perfect square, the square will be on a tilt. Start with a larger square, such as a 5-by-5 square. 5-by-5 square has an area of 5 square units. Try to draw a tilted square inside the 5-by-5 square so that the sum of the areas of the four surrounding triangles is 5 7, or 8. Here are two ways to draw a tilted square with vertices on a 5-by-5 square. rea of tilted square 5 4() 7 sq. units rea of tilted square 5 4() sq. units The square on the left has an area of 7 square units, so each of its sides is a segment with a length of 7 units. 48 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

7 CONDENSED L E S S O N.4 The Pythagorean Theorem Previous In this lesson you will discover the Pythagorean theorem use the Pythagorean theorem to find the missing side length of a right triangle In your book, read the text before the investigation. It explains that the area formula for a triangle is base height rea or bh Investigation: The Sides of a Right Triangle The diagram on page 599 of your book shows a right triangle with squares drawn on the sides. Find the area of each square and record the results in a table like the one shown in Step 4. Then, copy each right triangle below, draw a square on each side, and record the areas in your table. Repeat these steps for two right triangles of your own. Triangle Triangle Triangle 4 Here are the results for the triangle in your book and the three triangles above. rea of square rea of square rea of square on leg on leg on the hypotenuse Triangle Triangle Triangle 6 7 Triangle For each right triangle, you should find that the area of the square on the hypotenuse is equal to the sum of the areas of the squares on the legs. Now, calculate the lengths of the legs and the hypotenuse for each triangle. Length of leg Length of leg Length of hypotenuse Triangle 4 0 Triangle 8 Triangle 4 7 Triangle (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 49

8 Previous Lesson.4 The Pythagorean Theorem (continued) For each right triangle, you will find that this rule relates the lengths of the legs to the length of the hypotenuse. (length of leg ) (length of leg ) (length of hypotenuse) The relationship you discovered in the investigation is known as the Pythagorean theorem. theorem is a mathematical formula or statement that has been proven to be true. Read the statement of the theorem on page 600 of your book. The Pythagorean theorem is useful for finding the length of one side of a right triangle when you know the lengths of the other two sides. The example in your book shows how to use the theorem to find the distance from home plate to second base on a baseball diamond. Read that example and then read the example below. EXMPLE The size of a television set or computer monitor is described by giving the length of the diagonal of its screen. The screen on Jackson s 7-inch television has a height of about 6.5 inches. How wide is the screen? Solution Here is a sketch of Jackson s television. The drawing shows a right triangle, with the height and width of the screen as legs and the diagonal as the hypotenuse. 7 in. 6.5 in. a You can use the Pythagorean theorem to find the width of the television. a b c The Pythagorean theorem. a One leg has a length of 6.5, and the hypotenuse has a length of 7. a a a a.56 Calculate the squares. Subtract from both sides. Take the square root of both sides. Evaluate. The television screen is about.56 inches wide. 50 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

10 Previous Lesson.5 Operations with Roots (continued) Use what you have learned to find the area of each rectangle in Step 6. Here are the results for parts b and d. b d. 7 8 (5 6 ) () 4(4) The area is 8 square inches. The area is about 50.5 square centimeters. Now, follow along with Example B in your book. Then, read the rules for rewriting radical expressions on page 605. Example C shows you how to use the rules to check a solution to a quadratic equation. Here is another example. EXMPLE Show that is a solution to x 6x 7 0. Solution x 6x 7 Original expression. ( ) 6( ) 7 Substitute for x. ( ) Distribute 6 over. Use a rectangular diagram to square. 9 (9 ) Combine terms,, and 6. 0 dd and subtract. Substituting ( ) for x makes the expression x 6x 7 equal to 0, so is a solution to the equation x 6x Discovering lgebra Condensed Lessons 00 Key Curriculum Press

11 CONDENSED L E S S O N.6 Distance Formula Previous In this lesson you will discover the distance formula, which is used to find the distance between two points solve equations involving radical expressions Example in your book shows how you can find the distance between two points by plotting them, drawing a right triangle, and applying the Pythagorean theorem. Read this example carefully. In the investigation, you will learn a formula that can be used to find the distance between two points without plotting them. Investigation: musement Park Steps 4 Look at the map of the amusement park on page 6. You can find coordinates for each of the attractions. a. crobats: (, 4) b. Ball Toss: (, ) c. Bumper Cars: ( 4, ) d. Ferris Wheel: (0, 0) e. Hall of Mirrors: (, ) f. Mime Tent: (, ) g. Refreshment Stand: ( 5, ) h. Roller Coaster: ( 4, 5) i. Sledge Hammer: (, ) Find the exact distance between each pair of attractions listed in Step. For attractions that are not on the same horizontal or vertical line, you will need to draw a right triangle and use the Pythagorean theorem. For example, you can use this triangle to find the distance between the Refreshment Stand and the Ball Toss. w Refreshment stand d 4 4 d 9 6 d 5 d Ball toss You should get these answers. a. 6 units b. 0 units c. units d. 5 units e. 85 units The Roller Coaster and the Sledge Hammer are farthest apart. Using the Pythagorean theorem, you can calculate that the distance between them is 0 units. If each unit represents mile, they are mile apart. Suppose Chris parks his car at (7, 9). Imagine a right triangle with a hypotenuse extending from the Refreshment Stand to Chris s car. The length of the horizontal leg is the difference in the x-coordinates: 7 ( 5). The length of the vertical leg is the difference in the y-coordinates: 9. If d is the length of the hypotenuse, then d, or 605; so d 605, or about 4.6 units. If each unit is 0. mile, this is.46 miles. (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 5

12 Previous Lesson.6 Distance Formula (continued) Steps 5 9 Two new attractions are being considered for the park. The first, P, will have coordinates (x, y ), and the second, P, will have coordinates (x, y ). You can draw a right triangle with legs parallel to the axes and hypotenuse P P. y P (x, y ) P (x, y ) x The vertical distance between P and P is y y. The horizontal distance between P and P is x x. Using the Pythagorean theorem, you know that distance (x x ) (y y ) Taking the square root of both sides, you get the formula distance (x x y ) ( y ) This formula works for any two points. For example, the Bumper Cars have coordinates ( 4, ), and the Mime Tent has coordinates (, ). You can use the formula to find the distance between these two attractions. distance ( 4)) ( ( ( )) (7) (6) The formula you derived in the investigation is known as the distance formula. Read about the formula on page 64 of your book. lso, read Examples B and C. Example C stresses the importance of checking your solutions when you solve a square root equation. Here is another example. EXMPLE Solve the equation x 5 x 4. Solution x 5 x 4 The original equation. ( x 5 ) (x 4) Square both sides to undo the square root. x 5 x 8x 6 The result of squaring. 0 x 0x dd x and 5 to both sides. x or x 7 Use the quadratic formula, a graph, or a table to solve. Check: () 5 and 4, so is not a solution. (7) 5 9 and 7 4, so 7 is a solution. 54 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

13 CONDENSED L E S S O N.7 Similar Triangles and Trigonometric Functions Previous In this lesson you will solve a proportion to find a missing side length in a pair of similar triangles identify the legs opposite and adjacent to an acute angle of a right triangle calculate the sine, cosine, and tangent ratios for the acute angles of a right triangle You know that similar polygons have corresponding sides that are proportional. Example in your book reviews how to find an unknown side length of similar triangles by solving a proportion. Read and follow along with this example. Then, read the text following the example. Investigation: Ratio, Ratio, Ratio Below are four right triangles. In each triangle, the side labeled o is the leg opposite angle and the side labeled a is the leg adjacent to angle. The side labeled h is the hypotenuse. Triangle Triangle Triangle 4 o a h h a o o Triangle h a h a o For each triangle, find the measure of angle, and record it and the side lengths in a table. Draw two or three more right triangles and add their information to the table. Here are the measurements for the triangles above. Triangle Triangle Triangle Triangle 4 Measure of angle Length of adjacent leg (a) 5 6 Length of opposite leg (o) Length of hypotenuse (h) o Calculate the ratios h, a h, and o a for each triangle. Here are the results for the same triangles. Triangle Triangle Triangle Triangle 4 Measure of angle o h a 5 6 h a o (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 55

14 Previous Lesson.7 Similar Triangles and Trigonometric Functions (continued) Now, with your calculator in the degree mode, find the sine, cosine, and tangent of angle, and record the results in a table. (See Calculator Note to learn about these functions on your calculator.) Here are the results for these triangles. Triangle Triangle Triangle Triangle 4 Measure of angle sine cosine tangent These results are approximately equal to the ratios in the previous table. If you had measured the angles to the nearest tenth or hundredth of a degree, they would be closer. The sine, cosine, and tangent ratios abbreviated sin, cos, and tan are defined as follows. sin o pposite leg hypotenuse cos a djacent leg opposite leg hypotenuse tan a djacent leg Choose one of the four triangles, and draw a larger right triangle with an acute angle congruent to angle. Label the congruent angle D. Measure the side lengths, and calculate the sine, cosine, and tangent ratios for angle D. You should find that the ratios are the same as those for the original triangle. The sine, cosine, and tangent are called trigonometric functions and are fundamental to the branch of mathematics called trigonometry. Learning to identify the parts of a right triangle and evaluate these functions for particular angle measures is an important problem-solving tool. The box on page 60 reviews what you have learned about these functions. Example B in your book shows you how to find the sine, cosine, and tangent ratios for particular angles of a triangle. Read Example B and then read the example below. EXMPLE Find these ratios for this triangle. B a. cos b. tan c. cos B d. sin B Solution For angle, a 8, o 6, and h 0. a 8 a. cos h b. tan o 6 a 8 4 For angle B, a 6, o 8, and h 0. a 6 a. cos B h 0 5 b. sin B o 8 h C 8 56 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

15 CONDENSED L E S S O N.8 Trigonometry Previous In this lesson you will use trigonometric functions to find side lengths of a right triangle use inverse trigonometric functions to find angle measures of a right triangle use trigonometry to help you interpret a topographic map If you know the measure of on acute angle of a right triangle and the length of one side, you can use trigonometric functions to find the lengths of the other sides. If you know the lengths of the sides, you can use inverse trigonometric functions to find the measures of the angles. These ideas are demonstrated in Examples and B in your book. Here are two more examples. EXMPLE Find the value of x in this triangle. y 50 cm x Solution The variable x represents the length of the leg opposite the angle. The length of the adjacent leg is 50 cm. tan a o Definition of tangent. x tan 5 Substitute for and 50 for a tan x Multiply both sides by x Evaluate the tangent function and multiply. The length of x is about 9. cm. Now, see if you can find the length of y. EXMPLE B Find the measure of angle Solution Because you know the length of the leg adjacent to angle and the length of the hypotenuse, you can find the cosine ratio. cos You can find the measure of the angle with the inverse cosine of 0.0. cos (0.0) 7 (continued) 00 Key Curriculum Press Discovering lgebra Condensed Lessons 57

16 Previous Lesson.8 Trigonometry (continued) Investigation: Reading Topographic Maps The topographic map on page 67 of your book shows the elevation of a hill. On the map, there is a vertical rise of 0 meters between every two rings, or contour lines. Study the map until you think you understand it. The contour lines are farther apart on the west side of the summit than on the east side. This indicates that the rise is more gradual as you approach the summit from the west. Suppose you hike from the west side, over the summit, and down the east side. The contour lines and the summit divide the hike into 8 sections. The slope of each section is the vertical rise (the change in elevation) divided by the horizontal run (the distance between contour lines). This drawing shows a slope triangle for each section of the hike Use the Pythagorean theorem to find the length of the hypotenuse of each slope triangle. This length approximates the actual distance hiked during that section of the hike. Here are the results. Section : 6. m Section : 9. m Section : 5.9 m Section 4: 0. m Section 5: 50.5 m Section 6: 8. m Section 7: 6. m Section 8: 8. m Use the inverse tangent function to find the angle of climb for each section. For example, tan is the angle of climb for section. Section : 8 Section : Section : Section 4: Section 5: 8 Section 6: 45 Section 7: 4 Section 8: 45 Measure each angle and compare your results with those above. Now, read the remainder of the lesson in your book. 58 Discovering lgebra Condensed Lessons 00 Key Curriculum Press

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