what is parallelogram

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A parallelogram is a plane figure with four straight sides such that the two pairs of sides opposite to one another are also parallel to one another.

It is a rectangle stretched out of whack

it is a 2d geometric figure which is a quadrilateral. opp sides are  congruent and sides opp. one another are parallel. and angles at each corner are congruent to the one diagonal from it

A parallelogram is a 4 sided object (quadrilateral) that have parallel sides that are equal to each other. For instance, take a square. All the sides are congruent. A rectangle have 2 pairs of equal sides yet there are not all equal.