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If a cylindrical tower D metres in ...

If a cylindrical tower `D` metres in diameter and `H` metres high is capped with a semi-spherical dome, then the total visible surface of the tower will be `(piD)/2(2H+D)` (b) `(piD)/3(H+2D)` (c) `(piD)/2(2H+D/2)` (d) `(piD)/3(2H+D/2)`

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