Identifying the Vertical Angle of ∠1

The angle that is vertical to ∠1 is typically the angle that is opposite to it when two lines intersect. Vertical angles are equal and are formed by the intersection of two lines.

Without a visual reference to the angles, I can’t specify which angle is vertical to ∠1 among ∠2, ∠3, ∠4, and ∠5. However, you would identify the vertical angle by looking for the angle that is directly across from ∠1 at the intersection point.

For a clearer understanding, check your diagram for the angles formed and look for the one located directly opposite to ∠1. If you need more help, feel free to ask!