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No, because all quadrilaterals have 4 straight sides.

Q: Do all quadrilaterals have at least one pair of curved sides?

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yes

A trapezoid (or trapezium) has at least one pair of parallel sides.If you asked, "Name all the types of quadrilaterals which have at least one pair of parallel sides?", I would answer: Trapezoid, rhombus, parallelogram, rectangle and square.

A trapezium and a parallelogram are both quadrilaterals with at least one pair of parallel sides.

There is no quadrilateral on that list that has only 1 pair of parallel sides.

trapezoid

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yes

A trapezoid (or trapezium) has at least one pair of parallel sides.If you asked, "Name all the types of quadrilaterals which have at least one pair of parallel sides?", I would answer: Trapezoid, rhombus, parallelogram, rectangle and square.

No. An example of a quadrilateral that doesn't have a pair of parallel sides is a kite.

A trapezium and a parallelogram are both quadrilaterals with at least one pair of parallel sides.

There is no quadrilateral on that list that has only 1 pair of parallel sides.

trapezoid

Trapezium

A parallelogram (and all its special cases) has two pairs of opposite sides that are congruent. An isosceles trapezium has one pair of congruent opposite sides. Selected irregular quadrilaterals can have a pair.

Maybe all the ones you talk about in school have at least one pair of equal sides, but there are an infinite number of other quadrilaterals that have no equal sides. Take four sticks ... 1 foot, 2 feet, 3 feet, and 4 feet. There's no problem gluing their ends together to make an ugly, out-of-shape quadrilateral.

Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.

They are a pair of quadrilaterals because they both have 4 sides and all 4 sides are equal.

A trapezoid has one pair of parallel sides. All other quadrilaterals have no parallel sides or two pairs of parallel sides.