180 degrees
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If the two angles sum adds up to 180 degrees, then they are supplementary angles.
a straight line or supplementary angles...which equal to 180 degrees.
straight line indicates 180o
If a straight line falling on two straight linesmakes the interior angles on the same side of it taken together less than two right angles , then the two straight lines , if produced indefinitely , meet on that side on which the sum of angles is less than two right angles.
A straight line in angles represents 180 degrees.