Since the angle of 331⁰ is in the fourth quadrant, then the measure of its reference angle in the first quadrant is 360⁰ - 331⁰ = 29⁰ .
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A 331 degree angle is a reflex angle and it nearly looks like a circle because there are 360 degrees in a circle.
Since a full circle is 360°, a 331° angle is the outside measure of a 29° angle.
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complementary angle.
Sin(285) is a number, not an angle. The reference angle for 285 degrees is 285-360 = -75 degrees.