Area of a Parallelogram.

The area of a parallelogram is given by A = (base)(height).

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Positioning the parallelogram so that the long side is down will not change the area.  If the long side were called the height--instead of the base, as depicted above--then interchanging the labels "base" and "height" gives the same result.

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 Rectangle :  Parallelogram :  Triangle 1. :  Triangle 2.  :  Trapezoid 1.  :  Trapezoid 2. :  Circle 1. :  Circle 2.

Animations by Bettina Richmond and Tom Richmond.
Updated May 22, 2008.