Question

What is the measure of angle UST?

A cannot be determined
B 72 degrees
C 30 degrees
D 150 degrees

Answer 1

C 30 degrees

Explanation:

Sum of interior angles of a triangle = 180°

⇒ ∠UST + 78 + 72 = 180

⇒ ∠UST = 180 - 78 - 72

⇒ ∠UST = 30°