Question

which angle is supplementary to ∠4?

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 ∠4

In the given figure, ∠4 and ∠3 are adjacent angles that form a straight - line. So, ∠4+∠3 = 180 degrees.

Answer:

∠3