A polygon
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A quadrilateral is a closed plane figure with four straight sides.
A three sided closed plane figure (shape) is a triangle.
A trapezium (as it is known in English) is a quadrilateral which is a closed plane figure with four straight sides. It has one pair of parallel sides. The other pair of sides is not parallel (otherwise the figure would become a parallelogram).
it's a closed figure with straight sides
hendecagon