Question

which angle is complementary to ∠4?

Explanation:

Step1: Recall complementary - angle definition

Two angles are complementary if their sum is 90 degrees.

Step2: Analyze angle relationships

Since ∠3 is a right - angle (90 degrees), and ∠4 and ∠5 together form a right - angle with ∠3, ∠4+∠5 = 90 degrees. So, ∠5 is complementary to ∠4.

Answer:

∠5