Determine which of the following pairs of angles are coterminal.
STEP 1 : Determining whether the angles are coterminal or not
Coterminal angles are angles in standard position (angles with the initial side on the positive -axis) that have a common terminal side. For example, the angles and are all coterminal as shown in figure.
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.
Adding to we get,
Hence, we can say that are not coterminal angles.