Question

what is a vertical angle

Answer 1

Vertical angles are the angles that are opposite each other when two lines intersect. When two lines cross, they form four angles at the intersection. Each pair of opposite angles is equal, meaning that if two angles are vertical angles, they will have the same measure. For example, if one angle measures 50 degrees, the angle directly across from it (the vertical angle) will also measure 50 degrees. Vertical angles are a fundamental concept in geometry.