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).
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No trapezoids are parallelograms, and no parallelograms are trapezoids.
There are isosceles trapezoids which are sometimes called regular trapezoids.
NO rectangles are trapezoids
Trapezoids always have 4 sides, and 1 set of parallel lines.
No. Most Trapezoids are not isosceles. The non parallel sides must be congruent to be isosceles.