Use what you know about the angles in a triangle to find x in each diagram below. Show all work. Then classify each triangle as acute, right, or obtuse. Homework Help ✎
By the Angle Sum Theorem, the sum of all interior angles of a triangle is always 180°.
x + 40 + 80 = 180
x + 120 = 180
x = 60°
(2x) + (x + 12) + (96) = 180