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OpenStudy (anonymous):
Find the reference angle for -210^0 A) 150 degrees B) 60 degrees C) 240 degrees D) 30 degrees
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OpenStudy (anonymous):
30
OpenStudy (mathstudent55):
A reference angle is an angle in the first quadrant that measures the same as the angle made by the given angle and positive or negative x-axis.
OpenStudy (mathstudent55):
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