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Level 118

Ways to Prove the Quadrilaterals Are Parallelogram


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Theorem 5-4
If both pairs of opposite sides of a quadrilateral are congruent,, then the quadrilateral is a parallelogram.
Theorem 5-5
If one pair of opposite sides of a quadrilateral are both congruent and parallel, then the quadrilateral is a parallelogram.
Theorem 5-6
If both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram.
Theorem 5-7
If the diagonals of quadrilateral bisects each other, then the quadrilateral is a parallelogram.