Question

which angle is the included angle for $overline{de}$ and $overline{fe}$?
$angle d$
$angle e$
$angle f$

Explanation:

Step1: Recall included - angle definition

The included angle between two line - segments is the angle formed by the two line - segments at their common vertex.

Step2: Identify common vertex

The line - segments $\overline{DE}$ and $\overline{FE}$ share the common vertex $E$.

Answer:

$\angle E$