The intersecting lines on the dartboard form 10 pairs of vertical angles. The angles lie opposite of each other on the board and share the same measurement. The bull's eye in the center of the board serves as the vertex.

A vertical angle can be found when a person crosses his arms to form the shape of an X. Another example is some floor designs in which lines intersect to form vertical angles.

Vertical angles are defined as a pair of non-adjacent angles formed by two lines that are intersecting. The two lines form four angles at the intersection. The angles opposite each other are vertical angles. Vertical angles measure equally in degrees. Since the two angles measure the same, they are called congruent angles. The intersection of the two sides to form a point on the angle is defined as a vertex. Vertices is the plural form of vertex.