Question

volume of a hollow cylinder

Answer 1

Volume of hollow sphere is 4/3πR^3-4/3πr^3 where R means outer radius of sphere and r means inner surface area of sphere

Answer 2

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volume of a hollow cylinder = $\pi (R^2-r^2) h$

where,

$R^2$ is the outer radius

$r^2$  is the inner radius

$h$   is the height of the cylinder

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