Question

which angles are adjacent to each other? ∠hai and ∠edf ∠iae and ∠ade ∠iae and ∠edf ∠bec and ∠ced

Explanation:

Step1: Recall adjacent - angle definition

Adjacent angles share a common vertex and a common side.

Step2: Analyze each option

• For $\angle HAI$ and $\angle EDF$, they have no common vertex or side.
• For $\angle IAE$ and $\angle ADE$, they have no common vertex or side.
• For $\angle IAE$ and $\angle EDF$, they have no common vertex or side.
• For $\angle BEC$ and $\angle CED$, they share the common vertex $E$ and the common - side $\overrightarrow{EC}$.

Answer:

$\angle BEC$ and $\angle CED$