complementary angles add to 90 degrees
subtract from 90
90-35 = 55
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A complimentary angle which adds up to 90 degrees
There are two types of relationships: supplementary and complimentary. Supplementary angles always add up tp 180 degrees. Complimentary angles always add up to 90 degrees. If you are dealing with complimentary angles, look for a right angle.
Another 45o angle, as then their sum is 90o.
90 - 20 = 70 degrees.
180 - 35 = 145. Half of 145 is 72.5 which is the smaller angle. (The other angle is 35 + 72.5 ie 107.5)