It is 35.2 degrees, which is got by taking 54.8 from 90.
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Suppose the angle is x. Then its complement is 90-x. So x = (90-x) + 28 = 118 - x So 2x = 118 and x = 59 (with complement 31).
The supplementary angle of 57 degrees is 123 degrees The complementary angle of 75 degrees is 15 degrees So: 123 minus 15 = 108 degrees
4.939 radians.
It is 800!
8pi/9