what is complement in math
The complement is the amount you must add to something to make it whole. For example, in geometry, two angles are said to be complementary when they add up to 90Â°.One angle is said to be the complement of the other. In the figure below, angles PQR and RQS are complementary. RQS is the complement of PQR.he complement is the amount you must add to something to make it whole. For example, in geometry, two angles are said to be complementary when they add up to 90Â°.