Question

which angle is vertical to ∠bec?

Explanation:

Step1: Recall vertical - angle definition

Vertical angles are formed when two lines intersect. They are non - adjacent angles opposite each other.

Step2: Identify vertical angle to ∠BEC

Lines AD and BC intersect at point E. ∠BEC and ∠AED are non - adjacent and opposite each other.

Answer:

∠AED