Question

which angles are adjacent angles? ∠fec and ∠ghe ∠fec and ∠ihj ∠fec and ∠deh ∠fec and ∠dec

Explanation:

Step1: Recall adjacent - angle definition

Adjacent angles share a common vertex and a common side.

Step2: Analyze each option

• For $\angle FEC$ and $\angle GHE$, they do not share a common vertex or side.
• For $\angle FEC$ and $\angle IHJ$, they do not share a common vertex or side.
• For $\angle FEC$ and $\angle DEH$, they do not share a common side.
• For $\angle FEC$ and $\angle DEC$, they share the common vertex $E$ and the common side $EC$.

Answer:

$\angle FEC$ and $\angle DEC$