An infinite number. You can vary the distance between each of the two pairs, and you can rotate one of the pairs relative to the other.
Chat with our AI personalities
They are quadrilaterals which have two pairs of parallel sides.
A trapezoid is different from other quadrilaterals that have 2 pairs of parallel sides in that a trapezoid has only 1 pair of parallel sides of different lengths.
Quadrilaterals. Parallelograms have two pairs of parallel sides.
Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.
Rectangle? :P