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Reference AngleHow to find the positive acute reference angle The reference angle is the positive acute angle that can represent an angle of any measure. Basically, any angle on the x-y plane has a reference angle, which is always between 0 and 90 degrees. The reference angle is always the smallest angle that you can make from the terminal side of an angle (ie where the angle ends) with the x-axis. A reference angle always uses the x-axis as its frame of reference.
Rules of Angles and Reference anglePositive angles go in a counter clockwise direction. Below is a picture of a positive fifty degree angle 
Reference Angles in Quadrant II
What is the reference angle for the angle in the graph below?
What is the reference angle for a 210° angle?
What is the reference angle for a 300° angle?
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