Auxiliary angles are two angles that add up to 90 degrees. They are often used in geometry to find the measure of an unknown angle. To find the measure of an auxiliary angle, you can use the following expression: 180 – (measure of the known angle) = measure of the auxiliary angle.
Auxiliary angles are important because they can be used to solve a variety of geometry problems. For example, they can be used to find the measure of an unknown angle in a triangle, or to find the length of a side of a triangle.