A trapezium.
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rectagle ONE pair of parallel sides would be a trapezium or a trapezoid.
Trapezoids have only one pair of parallel sides.
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.
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.
A trapezium (most of the world) or a trapezoid (US).