180 - 143 = 37 degrees
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40 degrees ( 180 - 140 = 40 )
25
The supplement of a 75-degree angle is the angle that, when added to 75 degrees, equals 180 degrees (a straight line). To find the supplement of a given angle, you subtract the given angle from 180 degrees. Therefore, the supplement of a 75-degree angle is 105 degrees.
Two angles are said to be supplementary if they total 180 degrees. To find an angle's supplement, subtract its measure from 180.
Supplementary angles always total 180o, so 169o.