A trapezoid is a four-sided polygon, or quadrilateral, that has at least one pair of parallel sides. This unique property distinguishes trapezoids from other quadrilaterals and plays a crucial role in various geometric applications. The presence of parallel sides allows for specific calculations of area and angles, which are essential in the study of trapezoidal decomposition, where complex shapes can be broken down into simpler trapezoidal units for easier analysis.
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