Question

In a geometric diagram, ZA and ZB are complementary, and they form a straight line with ZC. If m/A = x,
m/B=(2x) °, and m/C=90°, what is the measure of ZB? (1 point)

○ 90°

○ 60°

○ 180°

O 30°

Answer 1

If A and B are complementary, x + 2x = 90°. So 3x = 90° → x = 30°. Then m∠B = 2x = 60°.

Answer: 60°.