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How to Compute the Reference Angles in Radians

If you need to compute the measure (in radians) of the reference angle for any given angle θ, you can use the rules in the following table.

image0.png

To find the reference angle for

image1.png

follow these steps:

  1. Determine the quadrant in which the terminal side lies.

    image2.png
  2. Do the operation indicated for that quadrant.

    image3.png
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