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What do complementary angles and complementary angles mean in mathematics?
Complementarity and complementarity both refer to the relationship between two angles. In junior high school, they all refer to the angle itself being between 0 ~ 180.

Complementarity: ∠ A+∠ B = 90, which is commonly found in right triangles, high-line triangles and triangles with round diameters.

Complementarity: ∠ A+∠ B = 180 is generally used for parallel lines, parallelograms, trapeziums, two angles opposite to a bisector arc, and so on.