Question

complementary angles are two angles with measures that have a sum of 90. Is this reversible?

Answer 1

reversible as in able to make a biconditional

Answer 2

no because not all angles with sum 90 deg are complementary... they can be one after another and still have the sum 90 deg but they don't stand on each other (share a same side)

Answer 3

are you sure?

Answer 4

the top angle in the triangle should be 90 deg (it's not a narrow angle triangle) but you get the point