is a quadrilateral with two pairs of parallel opposite sides

2 opposite angles are congruent

3 consecutive angles are supplementary

4 Diagonals bisect each another

Ways to prove a quadrilateral is a parallelogram:

1) show BOTH pairs of opposite sides are

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Parallelograms

Para., reactangle, rhombus, square properties

Question	Answer
Parallelogram	is a quadrilateral with two pairs of parallel opposite sides
Parallelograms-> 1	1 opposite sides are congruent
Parallelograms-> 2	2 opposite angles are congruent
Parallelograms-> 3	3 consecutive angles are supplementary
Parallelograms-> 4	4 Diagonals bisect each another
Ways to prove a quadrilateral is a parallelogram:	1) show BOTH pairs of opposite sides are