Given an angle, the angle which adds to it to make a right angle is called its complementary angle. For example, \(20^\circ\) is the complementary angle of \(70^\circ\).
Glossary
Complementary angle
Given an angle, the angle which adds to it to make a right angle is called its complementary angle. For example, \(20^\circ\) is the complementary angle of \(70^\circ\).