The measures of two angles of a triangle are 25° and 87°. is the triangle acute, right, or obtuse? explain. a. acute; the measure of the third angle is 68°. so all three angles are acute. b. acute; the measure of the third angle is 78°. so all three angles are acute. c. obtuse; 25° + 87° = 112° and 112° is an obtuse angle. d. right; 25° + 87° = 112° and 202° − -112° = 90°. previous next