Question

what is an angle that is supplementary to ∠4?

Explanation:

Step1: Recall supplementary - angle definition

Two angles are supplementary if their sum is 180 degrees. Adjacent angles formed by two intersecting lines are supplementary.

Step2: Identify adjacent angle to ∠4

∠4 and ∠3 are adjacent angles formed by the intersection of two lines. So, ∠3 is supplementary to ∠4. Also, ∠4 and ∠1 are adjacent angles formed by the intersection of two lines, so ∠1 is supplementary to ∠4.

Answer:

∠1, ∠3