Question

which angle is supplementary to ∠3?

Explanation:

Step1: Recall supplementary - angle definition

Two angles are supplementary if their sum is 180°.

Step2: Identify adjacent - angle to ∠3

From the diagram, ∠2 and ∠3 form a linear pair. A linear - pair of angles are supplementary. So, ∠2+∠3 = 180°.

Answer:

∠2