two intersecting lines create four angles;<1 and <3 are a verical pair
That's not accurate. When two lines intersect, they create a total of four angles, but they do not necessarily create a pair of vertical angles. Vertical angles are formed when two lines intersect, and the pairs of opposite angles are congruent.
Vertical angles are always congruent, meaning they have the same measure. In other words, if angle 1 and angle 3 are a pair of vertical angles, then angle 1 is equal in measure to angle 3.