Vertically opposite angles are congruent. Thus Angle AFD is vertical to angle AFB
Vertical angles are the angles opposite each other when two lines cross.
In other words, vertical angles are a pair of opposite angles formed by intersecting lines.
Vertically opposite angles are congruent.
Therefore, the angle vertically opposite to angle EFD is as follows;
AFB ≅ EFD (vertically opposite angles)
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