Question

which angle is vertical to ∠1? ∠6 ∠4 ∠5 ∠2

Explanation:

Step1: Recall vertical - angle definition

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

Step2: Identify vertical angle to ∠1

In the given figure, when the lines intersect at the common point, the angle opposite to ∠1 is ∠4.

Answer:

∠4