Which pair of angles are vertical angles?
∠EKF and ∠JKI
∠HKI and ∠JKI
∠FKG and ∠HKI
∠EKF and ∠HKI

The pair of angles that are vertical angles in the given diagram is: D. ∠EKF and ∠HKI.
Two angles are considered a pair of vertical angles if both angles are directly opposite each other and share a common vertex.
Vertical angles are also equal in measure.
Therefore, the pair of angles that are vertical angles in the given diagram is: D. ∠EKF and ∠HKI.
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