Every quadrilateral that is a standard square, rectangle, or parallelogram has at least ONE pair of parallel sides - and they all have two pairs of parallel sides.
For only ONE pair of parallel sides, you need an irregular trapezoid.
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A quadrilateral with at least one pair of parallel sides has multiple possible names, depending on what type of quadrilateral it is.SquareRectangleParallelogramRhomboidTrapezoidYou are probably looking for only one pair of parallel sides, which is a trapezoid - both regular and irregular.
sometimes
No. The congruent sides need not be parallel.
A trapezium.
rectagle ONE pair of parallel sides would be a trapezium or a trapezoid.