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"The length of a roller is \\( 40 \\mathrm { cm } \\) and its diameter is \\( 21 \\mathrm { cm } \\). It takes 300 complete\nrevolutions to move once over to level the floor of a room. Find the area of the\nterolutions to move once over to level the floor of a room. Find the area of the\ntoom in \\( \\mathrm { m } ^ { 2 } \\)."

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