a straight line
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SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
Supplementary angles add up to 180 degrees
The angle subtended (on) a straight line is 180°. Two such angles = 2 x 180 = 360°.
When two angles add up to 180 degrees, they are supplementary to each other.
Supplementary angles add up to 180 degrees