Coterminal Angles
Coterminal angles are angles in standard position (angles with the initial side on the positive -axis) that have a common terminal side. For example , and are all coterminal.
To find a positive and a negative angle coterminal with a given angle, you can add and subtract if the angle is measured in degrees or if the angle is measured in radians .
Example 1:
Find a positive and a negative angle coterminal with a angle.
A angle and a angle are coterminal with a angle.
Example 2:
Find a positive and a negative angle coterminal with a angle.
A angle and a angle are coterminal with a angle.