2 angles that add up to 180 degrees are supplementary
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A supplementary angle is 180 degrees. So, it depends how many supplementary angles you add together.
The angle sum of a pair of supplementary angles is 180 degrees.
The definition of supplementary angles is: Two angles whose sum is 180 degrees.If one of them is 180 degrees, then the other one is zero degrees.
They can be but not always because supplementary angles add up to 180 degrees.
20 degrees. the definition of a supplementary angle is two angles that add up to 180 degrees.