The angle which is not coterminal with 120° is 520°
What are coterminal angles?
"Any two angles that have the same starting and ending points regardless of the measurement are coterminal angles."
How to find coterminal angle?
"In order to find a coterminal angle, simply add or subtract 360 degrees of the terminal angle as many times as possible."
For given example,
Given angle: 120°
First we find the coterminal angles with 120°
The coterminal angles with 120° are:
120° + 360° = 480°
120° + 720° = 840°
120° - 360° = -240° (here, -360° means angle measured in clockwise direction)
So, the coterminal angles with 120° are 840°, 480°, -240°
Therefore, the angle which is not coterminal with 120° is 520°
Learn more about the coterminal angles here:
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