A rai is a unit of area equal to 1,600 square metres (16 ares, 0.16 hectares, 0.3954 acres), and is used in measuring land area for a cadastre or cadastral map. Its current size is precisely derived from the metre, but is neither part of nor recognized by the modern metric system, the International System (SI).

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Not who you're looking for? Others named rai: state-owned Italian broadcasting company · rural locality in Ternopil Oblast, Ukraine · family name · metropolitan province of the Church of the East

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