It is a trapezoid
A quadrilateral with only one pair of parallel lines is called a trapezoid.
A trapezium is a quadrilateral with two parallel lines.
A trapezoid is a quadrilateral with exactly two parallel sides.
A trapezoid
A trapezoid has exactly one pair of parallel lines
There are two definitions for trapezoids. One defines them as a quadrilateral with at least two parallel lines, which would include parallelograms. The other strictly defines trapezoids as quadrilaterals with exactly two parallel lines.
Parallelogram
trapezoid
A parallelogram.
A quadrilateral with exactly one set of parallel lines is known as a trapezoid (or trapezium in some countries). In this shape, one pair of opposite sides is parallel, while the other pair is not. The parallel sides are referred to as the bases, and the non-parallel sides are called the legs. Trapezoids can have various forms, including isosceles trapezoids, where the legs are of equal length.
Trapezium
Any quadrilateral with two sets of parallel sides is called a parallelogram.