Question

which angle is complementary to ∠4?

Explanation:

Step1: Recall complementary - angle definition

Two angles are complementary if their sum is 90 degrees.

Step2: Identify right - angle in the figure

We see that ∠1 + ∠2=90 degrees (right - angle marked). Also, ∠4+∠5 = 90 degrees as they form a right - angle.

Answer:

∠5