Question

what is an angle that is supplementary to ∠5?

Explanation:

Step1: Recall supplementary - angle definition

Two angles are supplementary if their sum is 180°.

Step2: Analyze the figure

In the given figure, ∠5 and ∠3 form a linear - pair (a pair of adjacent angles whose non - common sides are opposite rays).

Step3: Apply linear - pair property

The angles in a linear - pair are supplementary. So, ∠5+∠3 = 180°.

Answer:

∠3