Question

The measure of A is 100°. Angles A and B are supplementary. What is mB?

A. mB = 10°
B. mB = 80°
C. mB = 90°
D. mB = 180°

Answer 1

The measure of angle B is 80°. B is the correct answer.

Answer 2

B. mB = 80°

Explanation:

Supplementary angles add to 180 degrees

100 +x = 180

x = 180-100

x = 80 degrees