A four-sided polygon with two parallel sides is called a trapezoid. In a trapezoid, the two parallel sides are known as the bases, while the non-parallel sides are called the legs. The parallel sides of a trapezoid are of different lengths, distinguishing it from a parallelogram where both pairs of opposite sides are parallel and equal in length. The sum of the interior angles of a trapezoid is always equal to 360 degrees.
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A four-sided polygon with two parallel sides is called a trapezoid (US) or trapezium (UK). It requires that the parallel sides are not equal in length, or they would form a parallelogram. A trapezoid's bases are parallel, but the legs are not.
trapezoid
A square is a regular polygon with two sets of parallel sides. A parallelogram is an irregular polygon with one set of parallel sides. A rhombus is an irregular polygon with two sets of parallel sides. A rectangle is an irregular polygon with two sets of parallel sides. *Note - a regular polygon is a shape in which all sides are equal in length and all angles are equal in measurement.
Parallelogram
A polygon with four or more sides can meet these requirement.
A parallelogram, or variants of polygons with 6 or more sides.
That is a rectangle.