The trapezium
Last updated: 16 Nov 2008
The last quadrilateral you will meet in the GMAT is the trapezium. A trapezium is a quadrilateral with 1 pair of parallel sides.

All you need to know about a trapezium is how to calculate its area which is equal to the average of the two parallel sides x perpendicular distance between them
This is indeed very helpful. Earlier, I used to always confuse between various quadilaterals. Thanks !!!