A trapezoid becomes a parallelogram when it has two pairs of parallel sides. Normally, a trapezoid is defined as a quadrilateral with at least one pair of parallel sides. However, if a trapezoid has both pairs of opposite sides parallel, it meets the definition of a parallelogram. In other words, all parallelograms are trapezoids, but not all trapezoids are parallelograms. The key difference lies in the number of parallel sides: a trapezoid has at least one pair, while a parallelogram has two pairs.
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