Question

What is the measure of ∠ C?

Answer 1

∠ = 80°

Explanation:

The sum of the interior angles of a quadrilateral = 360°

Subtract the sum of the 3 given angles from 360 for ∠C

∠C = 360° - (90 + 112 + 78 )° = 360° - 280° = 80°

Answer 2

72

Explanation:

112 + 90 + 78 = 288

360 - 288 = 72