# Angle Notation

An angle is denoted by the angle symbol followed by three letters which represent points that form the angle. For example, the expression means “the angle formed by the points , and ” where the vertex of the angle is at the point .

The figure below also illustrates the angle

## Related

Congruent angles are denoted with tick marks across the angle.

Complementary angles can visually be denoted as two angles who sum to a perpendicular or square angle.

Supplementary angles can visually be denoted as two angles who sum to 180 degrees or PI degrees.