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Quadrilateral |
 | | Trapezoid (American Englist) or trapezium (British Eng): one pair of opposite sides is parallel. |
| | Trapezium (Am.) or trapezoid (Brit.): no sides are parallel. |
| | Isosceles trapezium (Brit.) or isosceles trapezoid (Amer.): two of the opposite sides are parallel, the two other sides are equal, and the two ends of each parallel side have equal angles. |
| www.brainyencyclopedia.com /encyclopedia/q/qu/quadrilateral.html (439 words) |
