Question

Angle B measures 60°. What is the measure of the angle that is complementary to angle B?

Answer 1

Complementary angles total 90°.

∠A + ∠B = 90°

∠A + 60° = 90° . . . . substitute the given information

∠A = 30° . . . . . . . . . subtract 60° from both sides of the equation

The angle that is complementary to ∠B measures 30°.