Two angles, ∠1 and ∠2, in a diagram are supplementary. If m∠1 = 77, what equation can you write to solve for m ∠2? Let m∠2 = x.

Question

A) x° = 90° - 77°
B) x° + 77° = 90
C) x° = 77°
D) x° + 77° = 180°

Answer 1

The correct equation to solve for m ∠2 is D) x° + 77° = 180°. This is because supplementary angles add up to 180 degrees.