One pair.
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2It has one pair more because a parallelogram has two pairs of parallel sides whereas a trapezoid only has one pair of opposite parallel sides of different lengths.
A trapezoid has one pair of parallel sides. They are opposite parallel lines of different lengths.
A trapezoid or trapezium has four sides, two of which are parallel.
A trapezoid has only one pair of parallel sides. These parallel sides are opposite and are of different lengths.
1 pair of parallel lines