An equilateral quadrilateral which would include a square.
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Then it's consecutive angles are supplementary.
In a parallelogram consecutive angles are always supplementary. This means they equal 180.
A supplementary angle is 180 degrees. So, it depends how many supplementary angles you add together.
2 angles that add up to 180 degrees are supplementary
The angle sum of a pair of supplementary angles is 180 degrees.