Question

which angle is vertical to ∠cfd?

Explanation:

Step1: Recall vertical - angle definition

Vertical angles are formed when two lines intersect. They are opposite each other and have equal measures.

Step2: Identify intersecting lines and vertical angles

Lines $AC$ and $DE$ intersect at point $F$. $\angle CFD$ and $\angle AFE$ are vertical angles.

Answer:

$\angle AFE$