Question

If two angles are complementary and one of the angles measures 27, what does the other angles measure?

Answer 1

Complementary means the two angles equal 90°, so 27°+x=90° or you could do 90-27= 63°. So the other angle measures 63°.

Answer 2

Complementary angles have a sum of 90°. Your equation is 27° + x = 90.° Simply reverse the equation to 90° -  27° to get 63°. The other angle has a measure of 63°.