The related acute is an acute angle (<90^@) that can be found between the terminal arm and the x-axis when the terminal arm is in quadrants 2, 3, or 4. There is no related acute angle if the terminal arm lies in quadrant 1. Here are some examples: If the terminal arm is in quadrant 2, do 180^@ minus the principle angle to find the related acute angle. If the terminal arm is in quadrant 3, do the principle angle minus 180^@ to find the related acute angle. If the terminal arm is in quadrant 4, do 360^@ minus the principle angle to find the related acute angle.
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