which angle is supplementary to ∠1?

which angle is supplementary to ∠1?
Answer
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 the angle forming a straight - line with ∠1
∠1 and ∠3 form a straight - line. So, ∠3 is supplementary to ∠1.
Answer:
∠3