The problem asks to find the angle that is congruent to angle $\angle AFB$, other than itself. Congruent angles have the same measure.

1. Problem Description

The problem asks to find the angle that is congruent to angle $\angle AFB$, other than itself. Congruent angles have the same measure.

2. Solution Steps

The diagram shows two intersecting lines. When two lines intersect, the angles opposite each other are called vertical angles, and vertical angles are congruent. $\angle AFB$ and $\angle EFC$ are vertical angles. Therefore, $\angle AFB$ is congruent to $\angle EFC$.

3. Final Answer

$\angle EFC$