TRAPEZOID
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A quadrilateral with one pair of parallel lines would be a trapezoid. : P
A right angle trapezoid
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.
rectagle ONE pair of parallel sides would be a trapezium or a trapezoid.
Trapezoids have only one pair of parallel sides.