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How can parallelograms be identified?

Sagot :

To prove that a quadrilateral is a parallelogram, show the following:
1)  It has two pairs of parallel opposite sides.
2)  It has two pairs of congruent opposite sides.
3)   Two opposite sides that are both parallel and congruent.
4) It has two pairs of congruent opposite angles.
5)  The diagonals bisect each other.