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Complementary angle to which angle?
Complementary angle of 74.2 degrees is (90 - 74.2) = 15.8 degrees
Complementary angles add to 90 degrees so the complementary angle to 70 degrees has a measure of 20 deg.
Complementary angles add up to 90*, so a 60* angle's complement is 30*.
Angles are complementary if they summate to the measure of a right angle (90 degrees). 90 - .01 = 89.99