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Determine the quadrant in which the terminal side lies. A 200-degree angle is between 180 and 270 degrees,
so the terminal side is in QIII. Subtract 180 degrees from the angle, which is 200 degrees.
You find that 200 – 180 = 20, so the reference angle is 20 degrees.
How to Compute Reference Angles in Degrees - dummies
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