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A measure of surface extension in two-dimensional space. "Area" is the Latin word for a vacant piece of level ground and still carries this more everyday meaning. The French shortened form are denotes a square of land with a side length of 10 meters, i.e., an area of 100 square meters. A hectare is a hundred are.

Area is a measure of the amount of an enclosed surface in terms of the number of squares with sides of unit length, or fractions of those squares, that could be fitted exactly into it. The area of an enclosed region on a curved surface (which can be determined by integral calculus is given by the area it would cover if spread out on a plane surface.

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