It was the ancient Babylonians and Greeks who classified angles into degrees out of 360 degrees which is full rotation of circle.
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The supplement of an angle is the angle that, when added to the original angle, equals 180 degrees. The complement of an angle is the angle that, when added to the original angle, equals 90 degrees. Therefore, the supplement of the complement of a 38-degree angle would be the angle that, when added to the complement of 38 degrees (52 degrees), equals 180 degrees. This angle would be 128 degrees.
The reference angle for an angle with the measure of 175 degrees is 5 degrees
30 degrees
If it is a complementary angle, the missing angle is 52 degrees. If it is a supplementary angle, the missing angle is 142 degrees. If it is an opposite angle, the missing angle is 38 degrees. Obviously, you need to know what type of angle you're looking for.
There are 90o in a right angle. A right angle is one-quarter of a full circle i.e. 360o.