Question

Which set of angles could be the interior angles of a triangle?

A. 109, 20°, and 60°
B. 20°, 20°, and 50°
C. 20°, 30°, and 50°
D. 20°, 60°, and 100°

Answer 1

D. 20°, 60°, and 100°

Explanation:

basically you're testing which set adds up to 180°:

D should immediately catch the eye since it has a simple 100°, and 60+20 is 80, making D the correct answer

a: 189°

b: 90°

c: 120°

d: 180°