42 degrees
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90 minus A = complementary angle
No angle can be complementary to a 140 degree angle, as the sum of complementary angles is 90 degrees. But angles which are supplementary to each other add together to form a 180 degree angle.
73.5+16.5 = 90 degrees which is a complementary angle
Subtract 35 from 90 to get the complementary angle. If you're looking for supplementary subtract from 180. 90-35 =55 . . . The Complementary angle = 55
86 degrees.