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Ah, let's create a happy little angle here. To find the reference angle for 550 degrees, we simply subtract 360 degrees from 550. So, 550 - 360 equals 190 degrees. That's your reference angle, a beautiful angle just waiting to bring some joy to your mathematical canvas.
90 degrees
360-331=2929 degrees is your reference angle. Remember your signs, though.
The angle of reference is in the first quadrant, and 90 degrees angle is not in the quadrant.
It is 310 degrees.