Question

which angle is vertical to ∠1? ∠4 ∠3 ∠2 ∠5

Explanation:

Step1: Recall vertical angles definition

Vertical angles are opposite angles formed by two intersecting lines, and they are equal.

Step2: Analyze the diagram

In the given diagram, ∠1 and ∠4 are formed by the intersection of two lines (the vertical and horizontal lines). ∠1 is adjacent to ∠2 and ∠5, and ∠4 is opposite to ∠1 across the intersection point. ∠3 is not opposite to ∠1. So by the definition of vertical angles, ∠4 is vertical to ∠1.

Answer:

∠4