Question

angle b measures 60°. what is the measure of the angle that is complementary to angle b? 30° 60° 120° 180°

Explanation:

Step1: Recall complementary - angle definition

Complementary angles sum to 90°.
Let the complementary angle to angle B be x. Then x + ∠B=90°.

Step2: Substitute the value of ∠B

Given ∠B = 60°, we have x+60° = 90°.

Step3: Solve for x

x=90° - 60° = 30°.

Answer:

A. 30°