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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).
circular inch is a unit of area. it uses in Imperial/US system. it exactly equal π⁄4 sq in and approximately ≈ 5.067075 × 10−4 m2