Find the volume of space between cylinders

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volume between cylinders

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How would I find the between the gaps in the picture?

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In top view the area of one gap is equal to the difference of a circle and it's circumscribed square. So,

$A_{gap} = d^2 - \pi \frac{d^2}{4} = \frac{25}{4} (4- \pi)$

Multiplying by height and total gaps gives the result

$A_{total} = 36 × A_{gap} = 225 (4 - \pi )$