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Quadrilaterals are two-dimensional shapes that have four sides. Quadrilaterals that have only one set of parallel sides are called trapezoids.
No, shapes with odd numbers of sides do not always lack parallel sides. For example, a trapezoid is a four-sided shape (even number of sides) that has one pair of parallel sides, while an irregular pentagon (five sides) can have no parallel sides at all. The presence of parallel sides depends on the specific properties and measurements of the shape, not solely on whether the number of sides is odd or even.
Any polygon, other than a triangle, can have one pair of parallel sides.