Question

which angles are adjacent to each other?
∠1 and ∠8
∠8 and ∠2
∠1 and ∠4
∠5 and ∠1

Explanation:

Step1: Recall the definition of adjacent angles

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

Step2: Analyze each pair

• For $\angle1$ and $\angle8$: No common side.
• For $\angle8$ and $\angle2$: No common side.
• For $\angle1$ and $\angle4$: They have a common side and a common vertex and no overlapping interior points.
• For $\angle5$ and $\angle1$: No common side.

Answer:

$\angle1$ and $\angle4$