# Identifying Triangles 5.5

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1 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

2 Answer Key Pages 19 and 20 Name Page 29 Number of Vertices Definition for each quadrilateral could include something from the following: A square has four sides. All corners are right angles and all sides are equal. The diagonals cross at right angles at the center of the square. A rectangle has four sides. All the four corners are right angles. Opposite sides are equal in length. It has two pairs of parallel sides. Page right triangle, isosceles 2. isosceles acute triangle 3. equilateral acute triangle 4. scalene obtuse triangle 5. isosceles acute triangle 6. scalene obtuse triangle 7. right isosceles triangle 8. right triangle, isosceles Feature triangle 3 There are six different sorts circle 0 It has one edge rhombus 4 It has four sides of equal length pentagon 5 A five sided shape octagon 8 An eight sided, closed shape rectangle 4 It has four right angles parallelogram 4 Opposite sides are equal and parallel Name Number of Faces Shape of Faces Number of Vertices tetrahedron 4 triangle 4 cube 6 square 8 triangular prism 5 triangle rectangle 6 cylinder 3 rectangle circle 0 dodecahedron 12 regular pentagon 20 cuboid 6 rectangle 8 icosahedron 20 triangle 12 Page hexagon 2. isosceles triangle 3. pentagon 4. parallelogram 5. quadrilateral/trapezoid 6. rhombus Page (1, - 8) 2. ( - 7, 2) 3. ( - 1, - 2) 4. (0, - 10) 5. (9, - 6) 6. (9, - 6) dodecagon eratosthenes Student Pages Page Shape a = parallelogram 2. Shape b = rectangle 3. Shape c = rectangle 4. Shape d = trapezoid/quadrilateral 5. Shape e = isosceles triangle Page (5, 6); parallel sides: (-2, 6) (-2, 9) and (5, 6) (5, 9); (-2, 9) (5, 9) and (5, 6) (5, 9). 2. (-4, -1); parallel sides: (-8, -1) (-4, -1) and (-10, -5) (-6, -5); (-10, -5) (-8, -1) and (-6, -5) (-4, -1). 3. (10, 5); parallel sides: (8, 1) (10, 5) and (6, 5) (8, 7); (8, 7) (10, 5) and (6, 5) (8, 1). 4. (-10, 6); parallel sides: (-5, 6) (-3, 8) and (-10, 6) (-8, 8); (-8, 8) (-3, 8) and (-10, 6) (-5, 6). 5. (-1, -5); parallel side: (-7. -3) (-2, -3) and (-8, -5) (-1, -5). 135

3 5 How to Understand Triangles Facts to Know A triangle, in plane geometry, is a closed figure that has three line segments for sides. The sides meet at three points called vertices, and each vertex forms an angle with two of the sides. The word triangle means three angles. The sum of the three angles of a triangle is always 180. The symbol for triangle is. You use it when you write the name of a triangle. A triangle is named with the letters at each angle. The triangle below could have six names: BAC, CAB, ABC, BCA, CBA, or ACB. A The angles are named with the letters of the sides. Look at the right-hand angle in the triangle to the left. It could be named BCA or ACB. The letter of the vertex is always in the middle of the name. B C An angle in a triangle can also be named by the letter at its vertex: C. You can figure out an unknown angle in a triangle if you know the measure of the other two angles. Since the sum of the angles in a triangle is always 180, you can use addition and then subtraction to find the unknown angle. Here s an example: KLM = 95 LMK = 30 L 95 Find MKL. K 30 M Step 1: Add the two known angles: = 125. Step 2: The sum of the three angles is 180. Subtract the sum of the two known angles to find the measure of MKL: = 55. MKL = 55 22

4 5 How to Understand Triangles Facts to Know (cont.) Triangles Named by the Sizes of Their Angles Triangles are named according to either their largest angle or the lengths of their sides. You may want to review Unit 2, How to Understand Angles, before beginning this unit. Acute Triangle If each angle in a triangle is less than 90 (an acute angle), the triangle is an acute triangle Right Triangle A triangle with a right angle (an angle that measures 90 ) is a right triangle. The symbol indicates a right triangle. Obtuse Triangle If one angle of the triangle is greater than 90 (an obtuse angle), it is an obtuse triangle Note: No triangle can have more than one obtuse or one right angle. 23

5 5 How to Understand Triangles Facts to Know (cont.) Triangles Named by the Length of Their Sides Equilateral Triangle Equi means equal and lateral means sides. An equilateral triangle has three sides of the same length. An equilateral triangle also has three equal angles. A 14'' 14'' Sides: AB = BC = CA Angles: A = B = C C 14'' B Isosceles Triangle An isosceles triangle is a triangle with two equal sides. An isosceles triangle also has two equal angles because it has two equal sides. Angles that are opposite equal sides are also equal. Side MO = Side ON M is opposite side ON and N is opposite MO So, M = N. M 4'' O opposite 4'' N Scalene Triangle A scalene triangle is a triangle with no equal sides. Because there are no equal sides, there are no equal angles. All the angles have different measures. 9 cm cm cm

6 5 Practice Identifying Triangles Directions: Write the correct answer to each question. 1. What is the name of this triangle by the size 2. What is the name of this triangle by the length D 3. What is the name of this triangle by the size 4. What is the name of this triangle by the length Side DE = Side EF E F 5. What is the name of this triangle by the size 2'' " 6. What is the name of this triangle by the length " What is the name of this triangle by the size 8. What is the name of this triangle by the length 9. What is the name of this triangle by the size 10. What is the name of this triangle by the length 2 ft ft ft " 2 1 8" What is the name of this triangle by the size 2 3 8" L 12. What is the name of this triangle by the length ML = LN = NM M N 25

7 6 How to Learn More About Triangles Facts to Know Knowing the lengths of a triangle s sides can tell you something about its angles. The longest side of a triangle is the side opposite the largest angle. The shortest side is the side opposite the smallest angle. Examining Triangles Here are some examples showing the link between the length of a triangle s sides and its angles. M 6'' 5" O 4'' N A 5'' 6'' C 3'' B MN is the longest side, so O, which is opposite MN, is the largest angle. BC is the shortest side, so A, which is opposite BC, is the smallest angle. P Equilateral triangles have no longest and shortest sides. Therefore, opposite the three equal sides are three equal angles. PQ = QR = RP So, P = Q = R Q R An isosceles triangle with only two equal sides can have a longest or a shortest side. Look at these two examples: 5'' K 5'' 5'' E 5'' J 3'' L JL is the shortest side so K is the smallest angle of the triangle. D 7'' DF is the longest side, so E is the largest angle. F The other two angles in an isosceles triangle are opposite equal sides, so they are equal. Above, J = L and D = F. 26

8 6 How to Learn More About Triangles Facts to Know (cont.) Examining Triangles (cont.) Using the information on the previous page, you can solve problems about triangles their type and the size of their angles. In addition, you may be able to figure out the size of two angles if one angle and the sides are given. Look at this example that uses DEF. E 3'' Given: Problem: DE = FE d = 55 Find the number of degrees in F and E. D 55 F Step 1: Determine if there are any equal sides. Side DE = side FE, so the angles opposite these two sides are equal: D = F. Since D = 55, then F = 55, too. Step 2: Find the number of degrees in E. Remember, the sum of all the angles in a triangle is 180. You know two of them now, D and F, which are both 55. Add the two angles and then subtract the sum from 180 to find E = = 70 So, E = 70. Here s another example. This time, you don t know the lengths of the sides, but you can find the measures all three angles. Step 1: Find the number of degrees in a. You know that a and the 130 angle are supplementary, therefore, a = 180. Subtract to find a. Find b. b a = So, a = a c 120 Step 2: Find c. You know that c and the 120 angle are supplementary angles, therefore c = 180 ; subtract to find c. c = So, c =. 27 Step 3: Find b. The sum of the angles in a triangle is 180. You know the number of degrees in two of the angles. a + c = 50 + = 110 b = So, b = 70.

9 6 How to Learn More about Triangles Facts to Know (cont.) Right Triangles and the Hypotenuse The sides of a right triangle have a special relationship. When you add the squares of the two shortest sides, the sum equals the square of the longest side. In a right triangle, the longest side is called the hypotenuse. The other two sides are called legs. a c hypotenuse The formula for finding the hypotenuse is side a 2 + side b 2 = side c 2 (hypotenuse) or a 2 + b 2 = c 2. b This rule was discovered by a Greek mathematician named Pythagoras, and so the formula is called the Pythagorean theorem which states: The square of the hypotenuse is equal to the sum of the squares of the other two sides. Here s how to find the hypotenuse of a triangle. Sample a 5" c b 12" Step 1: The lengths of sides a and b are given. Put those numbers into the formula: side a 2 + side b 2 = side c = c 2 Step 2: Find the squares of the numbers you put in the formula = c 2 or 169 = c 2 Step 3: Finish solving the equation. c 2 = 169 c = 169 c = 13 So, the hypotenuse of the triangle is 13 inches. 28

10 6 Practice Directions: Write the correct answer. Finding the Degrees of Angles in Triangles Given ABC, where A = 55 and B = What is the measurement of C? 2. What kind of triangle is ABC? Given DEF, where D = and E = What is the measure of F? 4. What kind of triangle is DEF? E Given side DE (3 inches), side EF (3 inches), and E (70 )... 3'' 70 3'' 5. Find D and F. D F n Given an isosceles triangle, where m = p Find n. m p " c 7. Find the hypotenuse of this right triangle. 2" 9' 8. Find the missing side (b) of this right triangle. 15' b 29

11 Answer Key Pages 7 and 8 1. d 2. g 3. b 4. h 5. b 6. e 7. b 8. e 9. a 10. f 11. c 12. g 13. d 14. f Pages 12 and b 2. f 3. a 4. f 5. b 6. g 7. d 8. e 9. b 10. e 11. c 12. h Page g 6. f Pages 20 and radius 2. diameter 3. chord 4. circumference 5. 4 ft in ft in in ft miles yds ft in ft. 2 Page acute 2. equilateral 3. right 4. isosceles 5. obtuse 6. scalene 7. acute 8. isosceles 9. acute 10. scalene 11. acute 12. equilateral Page acute and scalene acute and equilateral 5. D = 55 F = c = 2.5'' 8. b = 12' Pages 32 and parallelogram 2. trapezoid 3. rhombus 4. rectangle 5. trapezoid 6. parallelogram ft ft ft ft ft ft. Pages 36 and ft ft yds in. 2, 176 in ft ft ft in ft ft ft in. 2 Pages 40 and in in ,154 in in ft ft , ft ft. 3 or ft. 3 Pages 42 and m; 9.5 m m; 9 m m; 81 m m m; 4.64 m cm m; m m ft ft quarts m ,560 ft ,840 yards acres 16. 3,780,000 pounds 17. A = 5,024 cm 2 C = 251 cm minutes 19. r = 50 cm A = 7,850 cm 2 C = 314 cm time = min 20. r = 30 cm A = 2,826 cm 2 C = cm time = min Pages 44 and cm 2 = 1,024 cm 2 2. P = 2(4s) = 16 cm 3. P = 4(4s) = 32 cm 4. A = 4(1 x w) = 16 cm 2 5. A = 16(1 x w) = 64 cm Let side of square A = 1 cm Let the side of square B = 4 cm Area square A = 1 cm Area square B = 16 cm The area of square B is 16 times greater than the area of square A. 8. Area of rectangle = 70 cm x 30 cm = 2,100 cm 2 2,100 cm cm 2 = 2,700 cm 2 30 x 2,700 cm 2 = 81,000 cm 2 of wood 9. Yes, they have the same area. Since you multiply the base and height, and these two parallelograms use the same numbers, so it doesn t matter which is the base and which is the height. 48

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