最終更新日：2025/11/20
Unit of measure for areas, defined as 43,560 square feet,https://web.archive.org/web/20041204052555/http://ts.nist.gov/ts/htdocs/230/235/appxc/appxc.htm or 4,046.8564224 square meters. A square mile has 640 acres.
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US survey acre
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