+A **trapezoid** is a [quadrilateral](/wiki/quadrilateral) with at least one pair of [parallel](/wiki/parallel) sides. These parallel sides are known as the bases, and the non-parallel sides are called legs. It is a fundamental two-dimensional polygon.
+## See also
+- [Area](/wiki/area)
+- [Parallelogram](/wiki/parallelogram)
+- [Geometry](/wiki/geometry)
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