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The are (/ˈɑːr/ or /ˈɛər/) is a unit of area, equal to 100 square metres (10 m × 10 m), used for measuring land area. It was defined by older forms of the metric system, but is now outside of the modern International System of Units (SI).
The term "cuerda" (and "Spanish acre") refers to various units of measurement in some Spanish-speaking regions, including Spain,Puerto Rico, Guatemala, Cuba, and Paraguay.