Question

If angle A measures 57 degrees and angle C is adjacent to angle A, what is the measure of angle C if the two angles are complementary?

Answer 1

33 degrees, 
90-57=33
complementary angles mean that together, the angles add up to equal 90 degrees

Answer 2

The definition of complementary angles is that the sum of two angles should be equal to 90 degrees. We can see that in this case angles A and C are complementary angles. So we can do 90-57 to get 33 and we can see that angle C would equal 33 degrees. Hope this helps. Feel free to ask more questions, or ask questions about my explanation.