Are consecutive angles of a parallelogram supplementary?

Updated: 2nd October 2019

DEFINITION: A parallelogram is a quadrilateral with both pairs of opposite sides parallel. THEOREM: If a quadrilateral has 2 sets of opposite angles congruent, then it is a parallelogram. * THEOREM: If a quadrilateral has consecutive angles which are supplementary, then it is a parallelogram.

Updated: 2nd October 2019

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