Question

other than itself, which angle is congruent to ∠1?

Explanation:

Step1: Recall the property of vertical angles

Vertical angles are congruent. Vertical angles are the angles opposite each other when two lines cross.

Step2: Identify the vertical angle of ∠1

Looking at the figure, ∠3 is the vertical angle of ∠1.

Answer:

\(\angle3\)