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Two or more angles in standard position with the same terminal side are called coterminal angles. For example, angles measuring 50^(∘), 410^(∘), and - 310^(∘) are coterminal angles.
If two angles are coterminal, the measure of one of them is equal to the measure of the other angle plus a multiple of 360^(∘), or in the case of radians, plus a multiple of 2π. Therefore, for any angle θ and any integer n, coterminal angles can be found by the following formula.
Degrees: & θ + n* 360 Radians: & θ + n* 2 π