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"(10) ) cylindrical roller is of length 2\\( \\mathrm { m } \\) and diameter 84\\( \\mathrm { cm } \\) . Find the number of revolution\nto cover an area of 7920\\( \\mathrm { m } ^ { 2 } . \\)"

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NCERT Solutions for Class 9 Maths Chapter 13

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