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. Adjacent angles that form a straight - line are supplementary.

Step2: Identify adjacent angle to ∠3

∠4 and ∠3 are adjacent angles that form a straight - line.

Answer:

∠4