A parallelogram has both pairs of sides parallel, whereas the trapezium has only one pair of sides parallel. For this to happen, the parallel sides have to be of different lengths.
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no, a parallelogram has two pairs of parallel sides, a trapezium has exactly one pair of paralell sides
Parallelograms have two pairs of parallel sides, trapezium only one. Both pairs of opposite sides of a parallelogram must be equal, in a trapezium at most one pair can be. Opposite angles of a parallelogram must be equal, not so for a trapezium.
A trapezium has one a pair of parallel lines, a parallelogram has two.
A trapezium has only one pair of parallel sides. A parallelogram has two pair of parallel sides. A rhombus is an equilateral parallelogram - that is, a parallelogram with equal sides.
A trapezium and a parallelogram are both quadrilaterals with at least one pair of parallel sides.