Question

which statement is true about the diagram?
∠def is a right angle.
m∠dea = m∠fec
∠bea ≅ ∠bec
→eb bisects ∠aef.

Explanation:

Step1: Analyze vertical angles

Vertical angles are equal. $\angle DEA$ and $\angle FEC$ are vertical angles.

Answer:

$m\angle DEA = m\angle FEC$