V

V is for vertical angles Verticle angles are angles that are on oposite sides and their degrees will always be equal.

The angles 1 and 3, 2 and 4, 5 and 7, and 6 and 8 are vertical angles. That would make their measurements equal!

variable- A letter that stands for a missing number vertex- A vertex of a polygon is a point where the 2 sides of the polygon intersects.
 * __12 + a = 27__ __4a=20__**