supplementary angles
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Supplementary angles add up to 180 degrees
It is a straight line because angles on a straight line add up to 180 degrees but angles greater than 180 degrees are reflex angles
Straight line, or 2 angles that add up to 180 degrees are called supplementary angles.
Supplementary angles add up to 180 degrees
Angles on a straight line add that up to 180 degrees are called supplementary angles