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A rectangular sheet of paper 40 cm xx 22...

A rectangular sheet of paper 40 cm `xx` 22 cm , is rolled to form a hollow cylinder of height 40 cm . The radius of the cylinder (in cm ) is

A

`3.5`

B

`7`

C

`(80)/(7)`

D

`5`

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Knowledge Check

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    `6546cm^(3)`
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