US Definition
A trapezoid is a closed plane figure consisting of four line segments/sides; two of these line segments are parallel (but not equal in length) and two are nonparallel.
(in the UK, this is called a trapezium)
British Definition
A trapezoid is a closed plane figure consisting of four line segments/sides; NONE of these line segments are parallel to any of the other line segments of the quadrilateral.
(in the US this is just a quadrilateral)
*(see the related links for images of trapezoids)
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