The supplement of 45 degrees is 135 degrees.
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Suppose the angle is x. Then its suplement is x/3. So x + x/3 = 180 degrees. ie 4x/3 = 180 or x = 180*3/4 = 135 degrees and its supplement is 135/3 = 45 deg. So the angle and its supplement are 135 and 45 degrees respectively.
The complement of an angle can be added to that angle to get a total of 90 degrees. Therefore, if your angle was 45*, set up a simple algebra problem. 45+x=90 subtract 45, you get x=45 The complement of a 45* angle is 45*. The complement of a 30* angle is 60, etc. The supplement of an angle can be added to said angle to get a total of 180 degrees, so if your angle is 45*, set up an algebra problem (again :P). 45+x=180 subtract 45, x=135. The supplement of a 45* angle is 135*. The supplement of a 30*angle is 150*, etc. Hope this helped!