Height times width is the formula for a quadralateral!
http://www.chacha.com/question/whatistheareafo...

That depends on the shape. Haha. is it a rhombus, a trapozoid, a square?
http://answers.yahoo.com/question/index?qid=201202...

1. Calculate area by taking the area of two triangles. You can take this shortcut only if two sides of your quadrilateral are parallel. Multiply the average of the lengths (parallel
http://www.ehow.com/how_5139902_calculatequadrila...
