A pair of supplementary angles.
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If the sum of two angles is 180° then they are called supplementary angles.
They are then complementary angles
SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
The angles that are equal to 180 are called supplementary angles. The angles that equal 90 degrees are called complimentary.
Two angles are complementary if the sum of their measures is 90 degrees.Two angles are supplementary if the sum of their measures is 180 degrees.