## Jumat, 23 Mei 2008

### Trapezoid

A trapezoid (in North America) or a trapezium (in Britain and elsewhere) is a quadrilateral, which is defined as a closed shape with four linear sides, that has one pair of parallel lines for sides. Some authors [1] define it as a quadrilateral having exactly one pair of parallel sides, so as to exclude parallelograms, which otherwise would be regarded as a special type of trapezoid, but most mathematicians use the inclusive definition.

The area formula is as follows:

A = h x ((a+b)/2)

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