Trapezoid
Convex quadrilateral with at least one pair of parallel sides
Trapezoid
In geometry, a trapezoid () in North American English or trapezium () in British English is a quadrilateral that has at least one pair of parallel sides. The parallel sides are called the bases of the trapezoid. The other two sides are called the legs or lateral sides. If the trapezoid is a parallelogram, then the choice of bases and legs is arbitrary. A trapezoid is usually considered to be a convex quadrilateral in Euclidean geometry, but there are also crossed cases. If shape ABCD is a convex trapezoid, then the ABDC is a crossed trapezoid. The metric formulas in this article apply in convex trapezoids.
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