A trapezium or trapezoid.
trapzoid
Only if it is a trapezoid (US usage) with one set of parallel sides, or a parallelogram with both sets of opposite sides parallel. The term quadrilateral only means that the shape has 4 sides.
It could easily be taken for a trapezoid.
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, or trapezoid
trapezoid
trapezoid
A trapezium (US) has no sides parallel, while a trapezoid has one set of unequal parallel sides.
A trapezoid is unique because it is a quadrilateral that has one set of parallel sides, and one set that is not parallel.
A trapezoid is unique because it is a quadrilateral that has one set of parallel sides, and one set that is not parallel.
trapzoid
A quadrilateral must have one and only one set of a parallel sides to be a trapezoid.
Only if it is a trapezoid (US usage) with one set of parallel sides, or a parallelogram with both sets of opposite sides parallel. The term quadrilateral only means that the shape has 4 sides.
rhombus
trapezoid
A trapezoid
It could easily be taken for a trapezoid.