Question

which angles are adjacent to each other? ∠1 and ∠15 ∠13 and ∠11 ∠2 and ∠16 ∠10 and ∠9

Explanation:

Step1: Recall adjacent - angle definition

Adjacent angles share a common side and a common vertex and have no interior - points in common.

Step2: Analyze each option

• For ∠1 and ∠15: They do not share a common side or a common vertex.
• For ∠13 and ∠11: They do not share a common side or a common vertex.
• For ∠2 and ∠16: They do not share a common side or a common vertex.
• For ∠10 and ∠9: They share a common side and a common vertex and have no interior - points in common.

Answer:

∠10 and ∠9