What is a Reference Angle?
- In other words, the reference angle is the other half of the whole or the quadrant.
Examples:

How do you find a Reference Angle?
- You can find the value of an angle from the reference angle, and vice-versa. - Depending on if the angle is in radians or degrees, you can find the reference angle by subtracting the horizontal axis value (in degrees or radians) from
-In Quadrant I, the angle is it's own reference angle.
Examples:
1.
Reference Angle= 360° - 300° = 60°
You subtract
2.
The closest x-axis to
3.
First, you have to find a co-terminal angle so it is easier to find the reference angle.
Now that you concluded
You subtract from 180 degrees because it is the closest x-axis to your co-terminal angle.
Sources/For More Help:
-Our textbook
-http://www.mathwarehouse.com/trigonometry/reference-angle/finding-reference-angle.php
-http://www.regentsprep.org/Regents/math/algtrig/ATT3/referenceAngles.htm
-http://www.mathopenref.com/reference-angle.html
-http://www.youtube.com/watch?v=3RD-zJUj5Bo&noredirect=1
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