Question

The measure of A is 90°. Angles A and B are supplementary. What is mB?

A. 0°
B. 90°
C. 110°
D. 180°

Answer 1

B.90 if angles are supplementary that means they add up to 180 degrees and 90 plus 90 is 180

Answer 2

B. 90

Explanation:

Since the two angles are supplementary, this means they both are on a flat line (180 degrees)

Since both A and B add up to 180, we take that number and subtract A (90) to get our answer: 90 degrees