Question

which angle refers to the same angle as ∠def? choose 1 answer:

Explanation:

Step1: Recall angle - naming convention

An angle can be named in different ways. The angle $\angle DEF$ has vertex $E$ and rays $ED$ and $EF$.

Step2: Identify equivalent - named angle

The angle with the same vertex $E$ and the same two rays in the same order is $\angle FED$. But usually, we name angles with the vertex in the middle. Another way to refer to the same angle is by using a single - letter name if the vertex has only one angle associated with it. In this case, there is no single - letter name available. The angle $\angle DEF$ can also be called $\angle FED$ as long as we are referring to the angle formed by the rays starting from $E$ passing through $D$ and $F$.

Answer:

$\angle FED$