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A right circular cylindrical tunnel o...

A right circular cylindrical tunnel of diameter 2m and length 40m is to be constructed from a sheet of iron. The area of the iron sheet required in `m^2,` is `40pi` (b) `80pi` (c) `160pi` (d) `200pi`

A

`40pi`

B

`60pi`

C

`80pi`

D

`100pi`

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