Question

A quadrilateral has angle measures of 50°, 72°, and 78°. What is the measure of the fourth angle?

160°
60°
50°
100°

Answer 1

160°

Explanation:

Quadrilateral's angles add up to 360 degrees.

So:

x = fourth angle measure (unknown currently)

50° + 72° + 78° + x = 360°

200° + x = 360°

x = 160°