Q: What quadrilateral have opposite sides are parallel?

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The Opposite Sides Parallel and Congruent Theorem states that if a quadrilateral has a pair of opposite sides that are parallel and congruent, then the quadrilateral is a parallelogram.

Then, the opposite sides are congruent.

A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.

The opposite sides of a parallelogram are parallel lines and a parallelogram is a 4 sided quadrilateral

parallelogram

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The Opposite Sides Parallel and Congruent Theorem states that if a quadrilateral has a pair of opposite sides that are parallel and congruent, then the quadrilateral is a parallelogram.

If it doesn't have parallel sides, it's just classified as a quadrilateral.

I would be seriously concerned if a quadrilateral had more than two pairs of opposite sides parallel! A quadrilateral with two pairs of opposite sides parallel is a parallelogram.

Then, the opposite sides are congruent.

A Trapezium (can have two opposite sides parallel)A kite has no parallel opposite sides

parellelagram

A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.

A square's opposite sides are parallel and all the sides are congruent.

Parallelogram

that quadrilateral would be called a trapezoid. :)

Only if it is a trapezoid (US usage) with one set of parallel sides, or a parallelogram with both sets of opposite sides parallel. The term quadrilateral only means that the shape has 4 sides.

A parallelogram is a quadrilateral with opposite sides that are parallel.