A quadrilateral (four-sided shape) is a parallelogram if it has two sets of parallel sides. If it has only one set, it is a trapezoid, also known as a trapezium.
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Because, in this four sided figure, the opposite sides are parallel to each other.
A trapezoid is a four-sided figure with two opposite sides parallel. A rectangle (and also a parallelogram) is a trapezoid but BOTH pairs of opposite sides are parallel.
A four sided figure with no parallel sides is a trapezium, but it is also an irregular four-sided polygon, tetragon, quadrilateral, or quadrangle.
A six-sided plane figure is called a hexagon.
A four-sided polygon with opposite sides parallel could be a square, a rectangle, or a rhombus.If it has one pair of opposite, parallel sides, then it is a trapezoid. If it has two pairs of opposite, parallel sides, then it is a parallelogram.