Question

which angle is congruent to ∠3?

Explanation:

Step1: Recall the definition of vertical angles

Vertical angles are formed when two lines intersect. They are opposite each other and are congruent.

Step2: Identify vertical angles with ∠3

Looking at the diagram, ∠3 and ∠1 are not vertical angles. ∠3 and ∠4 are not vertical angles. ∠3 and ∠5 are adjacent angles. ∠3 and ∠6 are vertical angles.

Answer:

∠6