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Name LESSON Date Class Practice B 8-6 Classifying Triangles Classify each triangle according to its sides and angles. 1. 2. 3. 4. 5. 6. 7. 8. 9. Identify the different types of triangles in each figure and determine how many of each there are. 10. Copyright © by Holt, Rinehart and Winston. All rights reserved. 11. 44 Holt Mathematics Practice B 8-6 Classifying Triangles Practice A 8-6 Classifying Triangles LESSON LESSON Classify each triangle according to its sides and angles. Classify each triangle according to its sides and angles. Choose the terms needed from the box. use equi obt l 2. e en iso isosceles right al sce le s ral isosceles acute 4. 1. 2. equilateral 4. 6. scalene right scalene acute 5. 7. scalene acute 9. 9. isosceles obtuse scalene right Identify the different types of triangles in each figure and determine how many of each there are. 10. scalene acute scalene obtuse 8. isosceles acute 8. equilateral 7. 6. isosceles right scalene right scalene acute 5. 3. isosceles obtuse scalene obtuse 3. ate ac ut e ute ac eles sce les e ht e rig t en u l c a a e sc sca us tuse isos cele len ob bt s o e 1. sc iso righ t ne ale sc isosc 11. isosceles obtuse Describe the different kinds of triangles in each figure by their sides and angles and determine how many of each there are. 10. 11. 1 scalene right , 2 isosceles right, 1 isosceles acute, 4 equilateral 1 scalene obtuse 4 scalene obtuse 1 scalene acute 2 isosceles acute, 2 isosceles obtuse 4 scalene right 43 Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Mathematics LESSON All triangles have at least two acute angles. Classify each triangle according to its sides and angles. 2. scalene obtuse If the third angle is acute, the triangle is an acute triangle. 3. isosceles acute scalene right scalene 5. 40 ft, 4 ft, 40 ft isosceles 4 in. A triangle is isosceles if two sides are the same length. equilateral 8. 5.6 m, 5.06 m, 5.16 m 9. 19 cm, 18 cm, 19 cm scalene 11. 178°, 1°, 1° 13. 45°, 40°, 95° obtuse 14. 23°, 90°, 67° 1. Each of the 3 angles is less than 90°, so the right 2m acute triangle. 5 ft 60° 5 ft 60° 60° 5 ft 2. The triangle has 3 sides that have the same 15. 55°, 60°, 65° right 2m Use the figure to complete the statements. 12. 90°, 40°, 50° obtuse 2m 3 cm isosceles triangle is an acute 7 cm 6 in. Classify each triangle according to the measures of its angles. 10. 25°, 75°, 80° A triangle is equilateral if all three sides are the same length. 5 in. 7 cm 7. 2.3 in., 2.3 in., 2.3 in. If the third angle is obtuse, the triangle is an obtuse triangle. obtuse A triangle is scalene if each side is a different length. 6. 22 ft, 22 ft, 21 ft isosceles If the third angle is right, the triangle is a right triangle. acute Classify each triangle according to the lengths of its sides. 4. 9.9 cm, 9 cm, 0.99 cm Holt Mathematics Reteach 8-6 Classifying Triangles Practice C 8-6 Classifying Triangles LESSON 1. 44 Copyright © by Holt, Rinehart and Winston. All rights reserved. equilateral length, so it is an triangle. Use the figure to complete the statements. acute 3. The triangle has a 90° angle, so it is a Identify the different types of triangles in each figure and determine how many of each there are. 16. right 10 cm triangle. 90° 45° 10 cm 4. The triangle has 2 sides that have the same 17. length, so it is an isosceles 45° 14 cm triangle. Use the figure to complete the statements. 1 isosceles acute, 2 scalene right, 2 scalene obtuse 3 equilateral 5. The triangle has an angle that measures more than 90°, so it is an obtuse 6. Each side of the triangle has a different length, so it is a Copyright © by Holt, Rinehart and Winston. All rights reserved. 45 Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Mathematics scalene Copyright © by Holt, Rinehart and Winston. All rights reserved. 102 14 in. 30° 10 in. triangle. 40° 110° 8 in. triangle. 46 Holt Mathematics Holt Mathematics