Question

what is an angle that is complementary to ∠1?

Explanation:

Step1: Recall complementary - angle definition

Two angles are complementary if their sum is 90°.

Step2: Analyze the figure

In the figure, if we assume that the right - angle is composed of two adjacent angles, and we know that ∠2 + ∠3=90°. Since ∠1 and ∠2 are vertical angles (vertical angles are equal), an angle that is complementary to ∠1 is ∠3.

Answer:

∠3