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Prove a quadrilateral is a parallelogramCriteria needed to prove a shape is a parallogramProperties of parallelograms: Angles | Sides | Diagonals |Interactive Parallelogram 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 parallelogram
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