Question

what is an angle that is supplementary to ∠3?

Explanation:

Step1: Recall supplementary - angle definition

Two angles are supplementary if their sum is 180 degrees.

Step2: Identify the supplementary angle

In the given diagram, ∠3 and ∠4 form a linear - pair. A linear - pair of angles is supplementary. So, the angle supplementary to ∠3 is ∠4.

Answer:

∠4