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Prove a quadrilateral is a parallelogramCriteria needed to prove a Quadrilateral is a ParallelogramProperties of parallelograms: Angles | Sides | Diagonals |Interactive Parallelogram | top Types of Parallelograms: rectangle | rhombus | square | rectangle vs. square | comparison of properties of each type of parallogram | Criteria prove quadrilateral is a parallelogram Minimum criteria needed to prove a quadrilateral is a parallelogramA common type of proof involves proving that a quadrilateral is a parallelogram. If any of the 5 conditions below are met, then the quadrilateral must be a parallelogram.
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