Talk:Trapezoid
Wikipedia entry for comparison
A trapezoid (in North America) or trapezium (in Britain and elsewhere) is a quadrilateral, which is defined as a shape with four sides, which has a pair of parallel sides. Some authors define it as a quadrilateral having exactly one pair of parallel sides, so as to exclude parallelograms.
The exactly opposite concept, a quadrilateral that has no parallel sides, is referred to as a trapezium in North America, and as a trapezoid in Britain and elsewhere. To avoid confusion, this article uses the North American wording. It also admits parallelograms as special cases of trapezoids (however, in this case, it is assumed that one pair of parallel sides is distinguished, and is the one referred to as "the pair of parallel sides").
In an isosceles trapezoid, the base angles are congruent, and so are the pair of non-parallel opposite sides.
I am a Brit, and as such, I can vouch for the accuracy of the British stuff. Can any US mathematician vouch for the accuracy of the US stuff??--SeanTheSheep 08:53, 14 May 2007 (EDT)