Question

which angles are adjacent to each other? ∠9 and ∠14 ∠13 and ∠12 ∠12 and ∠9 ∠4 and ∠12

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 $\angle9$ and $\angle14$: They do not share a common side or a common vertex.
• For $\angle13$ and $\angle12$: They do not share a common side or a common vertex.
• For $\angle12$ and $\angle9$: They share a common side and a common vertex and have no interior - points in common.
• For $\angle4$ and $\angle12$: They do not share a common side or a common vertex.

Answer:

$\angle12$ and $\angle9$