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The reference angle is the positive acute angle that can represent an angle of any measure. The reference angle must be . In radian measure, the reference angle must be . Basically, any angle on the x-y plane has a reference

Get StartedA reference angle is the angle between the terminal side of an angle and the x-axis. To find the reference angle, you take the angle (in radians or degrees) and plug it into the inverse function.

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This trigonometry video tutorial provides a basic introduction into reference angles. It explains how to find the reference angle in radians and degrees. N