A quadrilateral that has only one pair of parallel sides (the other pair not parallel) is a trapezium.
A kite, for example. But the general quadrilateral, with no specific name, also has no 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.
A quadrilateral has four sides that may or may not be equal or parallel If two sides are parallel and the other sides equal but not parallel it is a trapezoid
It is a trapezoid that has only 1 pair of parallel sides of different lengths
One pair? If it is one pair of parallel sides, then it is a trapezoid. If it has 2 pairs of parallel sides, then it is a parallelogram.
British definition differs with USAUSATrapezoidA quadrilateral with one pair of parallel sidesTrapeziumA quadrilateral with no sides parallelBritishTrapezoidA quadrilateral with no sides parallelTrapeziumA quadrilateral with one pair of parallel sides
a trapezoid is the only quadrilateral that has exactly 1 pair f parallel sides.
trapezoidA trapezoid has one pair of parallel sides.