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Which type of polygon has exactly one pair of parallel sides?

  1. Trapezoid

  2. Rectangle

  3. Square

  4. Rhombus

The correct answer is: Trapezoid

The correct answer is the trapezoid, as it is defined by having exactly one pair of parallel sides. This distinguishing characteristic sets trapezoids apart from other quadrilaterals that either have no parallel sides or more than one pair of parallel sides. Rectangles, squares, and rhombuses all have two pairs of parallel sides, which means they do not fulfill the criteria for having just one pair. A rectangle has pairs of opposite sides that are both equal and parallel, the same is true for squares and rhombuses, thus confirming that they cannot be classified as trapezoids. Therefore, a trapezoid is unique in its definition among the given options for having a single pair of parallel sides.