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Name 1 Triangles LESSON 98 CC.5.G.3 OBJECTIVE Classify and draw triangles using their properties. You can classify triangles by the length of their sides and by the measure of their angles. Classify each triangle. Use a ruler to measure the side lengths. Use the corner of a sheet of paper to classify the angles. • equilateral triangle All sides are the same length. • acute triangle All three angles are acute. • isosceles triangle Two sides are the same length. • obtuse triangle One angle is obtuse. The other two angles are acute. • scalene triangle All sides are different lengths. • right triangle One angle is right. The other two angles are acute. Classify the triangle according to its side lengths. It has two congruent sides. The triangle is an isosceles triangle. © Houghton Mifflin Harcourt Publishing Company Classify the triangle according to its angle measures. It has one right angle. The triangle is a right triangle. Classify each triangle. Write isosceles, scalene, or equilateral. Then write acute, obtuse, or right. 1. 2. 9 mi 78° 14 mi 66° Geometry 3. 10 m 4m 5 in. 36° 10 m 5 in. 15 mi 4. 5 in. 5. 6. 195 Name 1 Triangles CC.5.G.3 Classify each triangle. Write isosceles, scalene, or equilateral. Then write acute, obtuse, or right. 1. 2. 8 mm 118° 6 mm 37° 53° 10 mm 42 in. None of the side measures are equal. So, it is scalene angle, so it is a 3. . There is a right right triangle. 4. 50 cm 15 cm 22° 50 cm .`e% ),`e% )+`e% 5. sides: 44 mm, 28 mm, 24 mm angles: 110°, 40°, 30° 6. sides: 23 mm, 20 mm, 13 mm angles: 62°, 72°, 46° Problem Solving 7. Mary says the pen for her horse is an acute right triangle. Is this possible? Explain. 196 8. Karen says every equilateral triangle is acute. Is this true? Explain. Lesson 98 © Houghton Mifflin Harcourt Publishing Company A triangle has sides with the lengths and angle measures given. Classify each triangle. Write scalene, isosceles, or equilateral. Then write acute, obtuse, or right.