-- A trapezoid always has.
-- Any polygon with more than four sides can have, but doesn't always.
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A trapezoid has one pair of parallel sides. They are opposite parallel lines of different lengths.
Only one pair: trapezium.
Any plane polygon having four or more sides may have one pair of parallel sides.
Parallelograms have two sets of parallel lines. Trapezoids only have one pair of parallel lines.
trapezoid