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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).
Square link (sq. lk.) is an obsolete unit of UK Surveyors' Measure equal to 1089/2500 sq ft.