Question

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

Explanation:

Step1: Recall adjacent - angle definition

Adjacent angles share a common vertex and a common side.

Step2: Analyze each option

• For $\angle1$ and $\angle8$, they do not share a common vertex or side.
• For $\angle4$ and $\angle8$, they do not share a common vertex or side.
• For $\angle5$ and $\angle1$, they do not share a common vertex or side.
• For $\angle4$ and $\angle1$, they share a common vertex and a common side.

Answer:

$\angle4$ and $\angle1$