180 - 123 = 57 deg
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It is 123 degrees.
The supplement of an angle is the angle that, when added to the original angle, equals 180 degrees. Therefore, the supplement of a 45-degree angle would be 135 degrees, because 45 + 135 = 180. This relationship holds true for all angles, where the sum of an angle and its supplement is always 180 degrees.
180 - angle = supplement 180- 160 = 20 degrees
54
135 degrees is the supplement of 45 degrees. When you minus 45 degrees from 180 degrees you will get 135 degrees which is the supplement angle of 45 degrees.