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Reference Angles is the angle formed by a terminal side of a given angle (x°) and the x-axis. 

If the terminal side of the the given angle, , falls on:

Quadrant I:  Reference Angle = x°

Quadrant II:  Reference Angle = 180° - x°

Quadrant III:  Reference Angle = x° - 180°

Quadrant IV:  Reference Angle = 360° - x°

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