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.
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parallelograms have two sets of parallel lines trapezoids do not
No but all parallelograms are trapezoids
No, but all parallelograms are trapezoids.
no
No trapezoids are not parallelograms. Trapezoids are actually quadrilaterals and they have one pair of opposite sides. Parallelograms by definition have 2 pairs of parallel sides.