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Definition: A measure of a surface. For a rectangle, the area is the product of two adjacent sides. A triangle has an area equal to the product of half its base and its altitude. Areas of other rectilinear figures can be found as a combination of triangles. For plane curved figures, the area is found by integration.
Source: The Penguin Dictionary of Mathematics. London: Penguin, 2008. Credo Reference. Web. 08 August 2012.