Question

which angle is complementary to ∠4?

Explanation:

Step1: Recall complementary - angle definition

Two angles are complementary if their sum is 90°.

Step2: Analyze the given angles

We know that ∠1 is a right - angle (90°). And ∠1=∠3 + ∠4 (because of the angle relationships in the intersection of lines). So, ∠3 is complementary to ∠4 since ∠3+∠4 = 90°.

Answer:

∠3