Classify each triangle as acute, right, or obtuse. 35) D E F 36) A B C 37) G J H 38) K L M 39) H D J 40) X Y Z Classify each triangle as equilateral, isosceles, or scalene. 41) 2 ft 2 ft 42) 1 ft 3 5 14 in. 12 in. 5 in. 43) 16 cm 20 cm 12 cm 44) 3 m 1 3 3 m 1 3 3 m 1 3 45) 15 dm 4 5 15 dm 4 5 13 dm 1 5 46) 47) 48) 54 yd 12 yd 45 yd For Exercises 49–52, answer true or false. 49) A triangle can have two obtuse angles. 50) Each of the angles in an equilateral triangle has a measure of 60. 51) Every equilateral triangle has three acute angles. 52) A right triangle can have an obtuse angle. Solve each problem. 53) A hexagonal gazebo rooftop is made using equally-sized triangles. Use the picture to calculate the total area of the rooftop. (Note: A hexagon is a six-sided fi gure.) 4 ft 6 ft 54) Find the area of the front side of the gingerbread house below. 14 cm 6 cm6 cm 10 cm www.mhhe.com/messersmith SECTION 4.3 Triangles 317
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