Question

if two angles of a triangle measure 20 and 130 degrees, what is the measure of
the third angle?

○ 50°

○ 40°

○ 60°

○ 30°

Explanation:

Step1: Sum of triangle angles

Sum of angles in a triangle = $180^\circ$

Step2: Calculate third angle

Third angle = $180^\circ - 20^\circ - 130^\circ = 30^\circ$

Answer:

30°