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Name LESSON Date Class Practice C 9-6 Classifying Triangles Classify each triangle according to its sides and angles. 1. 2. 3. Classify each triangle according to the lengths of its sides. 4. 9.9 cm, 9 cm, 0.99 cm 5. 40 ft, 4 ft, 40 ft 6. 22 ft, 22 ft, 21 ft 7. 2.3 in., 2.3 in., 2.3 in. 8. 5.6 m, 5.06 m, 5.16 m 9. 19 cm, 18 cm, 19 cm Classify each triangle according to the measures of its angles. 10. 25°, 75°, 80° 11. 178°, 1°, 1° 12. 90°, 40°, 50° 13. 45°, 40°, 95° 14. 23°, 90°, 67° 15. 55°, 60°, 65° Identify the different types of triangles in each figure and determine how many of each there are. 16. Copyright © by Holt, Rinehart and Winston. All rights reserved. 17. 51 Holt Mathematics Practice B 9-6 Classifying Triangles Practice A 9-6 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. e cele s e isosceles right isosceles acute 4. 1. 2. equilateral 4. 6. scalene right scalene acute 5. 7. scalene acute 5. 3. isosceles obtuse scalene obtuse 3. ral s righ t t ob sce le isos e us 2. ate en ob les al len ne le sca 1. sc sca tuse sce iso ac use equi obt l iso ac ut e eles ute right ute ac ne ale sc isosc 7. 6. isosceles right scalene acute 9. 9. isosceles obtuse scalene acute scalene right Identify the different types of triangles in each figure and determine how many of each there are. 10. scalene right scalene obtuse 8. isosceles acute 8. equilateral 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 49 Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Mathematics LESSON Classify each triangle according to its sides and angles. 2. scalene obtuse All triangles have at least two acute angles. If the third angle is acute, the triangle is an acute triangle. 3. isosceles acute scalene right scalene 7. 2.3 in., 2.3 in., 2.3 in. equilateral 5. 40 ft, 4 ft, 40 ft isosceles 8. 5.6 m, 5.06 m, 5.16 m 4 in. 11. 178°, 1°, 1° 5 in. 13. 45°, 40°, 95° obtuse 14. 23°, 90°, 67° 1. Each of the 3 angles is less than 90°, so the right 2m 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 7 cm 3 cm isosceles triangle is an acute A triangle is equilateral if all three sides are the same length. 6 in. Classify each triangle according to the measures of its angles. 10. 25°, 75°, 80° A triangle is isosceles if two sides are the same length. 7 cm 9. 19 cm, 18 cm, 19 cm scalene 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 Review for Mastery 9-6 Classifying Triangles Practice C 9-6 Classifying Triangles LESSON 1. 50 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 right Identify the different types of triangles in each figure and determine how many of each there are. 16. 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. 51 Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Mathematics scalene Copyright © by Holt, Rinehart and Winston. All rights reserved. 107 14 in. 30° 10 in. triangle. 40° 110° 8 in. triangle. 52 Holt Mathematics Holt Mathematics