Question

which angle is a vertical angle with ∠efd?
○ ∠dfb
○ ∠ced
○ ∠bfc
○ ∠afb

Explanation:

Vertical angles are formed by two intersecting lines and are opposite each other, sharing a common vertex but no common sides. For $\angle EFD$, we look for the angle opposite to it at vertex $F$. The lines $AB$ and $ED$ intersect at $F$. $\angle EFD$ and $\angle AFB$ are formed by the intersection of these two lines, with $\angle AFB$ being opposite to $\angle EFD$.

Answer:

D. $\angle AFB$