Howstuffworks "Square measure - Encyclopedia Entry"

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Square measure

Square measure is the system used in the measurement of surfaces. The unit for the area of a surface is the square. Hence square is the name of the system used in measuring surfaces. We can describe a tabletop as being 12 inches long and 10 inches wide, or 12 by 10 inches. But these figures represent only lines, which have just one dimension--length.

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