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# complementary angles

Two angles are called complementary angles of each other, if their sum is the right angle $\displaystyle\frac{\pi}{2}$, i.e. $90^{\circ}$.

For example, the acute angles of a right triangle are complement angles of each other, since the angle sum in any triangle is $180^{\circ}$.

The tangent of an angle equals to the cotangent of the complement angle, and vice versa (provided that no one of the angles is a multiple of the straight angle).

Related:

ExplementaryAngle, SupplementaryAngles, GoniometricFormulae, ConvexAngle, Explementary

Synonym:

complement angles, complementary

Type of Math Object:

Definition

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Reference

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## Mathematics Subject Classification

51G05*no label found*51F20

*no label found*

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