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geometrya pair of angles that add up to 180 degrees.
Supplementary angles are a pair of angles that add up to 180 degrees. When two angles are supplementary, each angle is said to be the supplement of the other. For example, if one angle measures 120 degrees, its supplement would be an angle measuring 60 degrees, because 120 + 60 equals 180.
An angle is the figure formed by two rays sharing a common endpoint called the vertex. Its size, measured in degrees or radians, is the amount of rotation needed to align one ray with the other.
Complementary angles are a pair of angles whose measures add up to 90 degrees. When two angles are complementary, each angle is said to be the complement of the other.
A perpendicular angle is equal to a quarter of a full rotation. A perpendicular angle is measured as 90 degrees or π/2 radians.