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It is a trapezoid which has 1 pair of opposite parallel sides of different lengths
A quadrilateral with only one pair of parallel sides is a trapezoid (U.K. trapezium)
Any four-sided shape is a Quadrilateral. Square, Rectangle, Parallelogram, rhombus, trapezoid etc. It may have no parallel sides as in a kite, 1 parallel side as in trapezoid or 2 parallel sides as in parallelogram.
a trapezoid
A trapezoid