What length of solid cylinder 2 cm in diameter must be taken to cast into a holl

Question

What length of solid cylinder 2 cm in diameter must be taken to cast into a hollow cylinder of external diameter 12 cm, 0.25 cm thick and 15 cm long ?

Options:

A . 42.3215 cm

B . 44.0123 cm

C . 44.0625 cm

D . 44.6023 cm

Answer: Option C

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