Question

which angles are adjacent to each other?
∠11 and ∠6 ∠13 and ∠5 ∠16 and ∠13 ∠4 and ∠15

Explanation:

Step1: Recall the definition of adjacent angles

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

Step2: Analyze each pair

• For $\angle11$ and $\angle6$: They do not share a common side and vertex in the required adjacent - angle sense.
• For $\angle13$ and $\angle5$: They do not share a common side and vertex in the required adjacent - angle sense.
• For $\angle16$ and $\angle13$: They share a common side and a common vertex and have no overlapping interior points.
• For $\angle4$ and $\angle15$: They do not share a common side and vertex in the required adjacent - angle sense.

Answer:

$\angle16$ and $\angle13$