Question

which angles are supplementary to each other? ∠7 and ∠6 ∠5 and ∠11 ∠3 and ∠16 ∠11 and ∠9

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: Analyze each option

• For ∠7 and ∠6: They are vertical angles, not supplementary.
• For ∠5 and ∠11: They are not adjacent angles that form a straight - line and not supplementary.
• For ∠3 and ∠16: They are not adjacent angles that form a straight - line and not supplementary.
• For ∠11 and ∠9: They are adjacent angles that form a straight - line, so ∠11+∠9 = 180 degrees, they are supplementary.

Answer:

∠11 and ∠9