A Trapezium, called a Trapezoid in America.
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It is a quadrilateral with exactly 2 pairs of parallel sides.
It is a trapezoid that has one pair of opposite parallel sides of different lengths whereas a parallelogram has two pairs of parallel sides.
A trapezoid is a quadrilateral with at least one pair of parallel sides. This pair of parallel sides are known as the bases of the trapezoid. The other two sides are called the legs, and they are not parallel to each other. So, a trapezoid has exactly one pair of parallel sides.
A quadrilateral with one pair of parallel sides is called a trapezium (most of the world) or trapezoid (US) . If it was to have two pairs of parallel sides it would be a parallelogram.
Then, the opposite sides are congruent.