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Two angles on a straight line are said to be supplementary.
Two angles are supplementary if their measures add up to 180 degrees or π radians. Due to the fact that angles on a straight line sum 180 degrees, angles on straight lines are supplementary.
See also
Trivia
- Exterior angles and interior angles are supplementary
- The 3 angles of a Triangle are supplementary
- Opposite angles of Cyclic quadrilaterals are supplementary.