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We have a quarter circle in a square.

Please calculate the volume after rotating the colored part around $BC$ for $360^\circ$. I prefer solutions without calculus but if you could'nt find one without it, mentioning the calculus way is also really helpful.

PS: Don't pay attention to the thing near the AB and AD sides. It means the square side is equal to 3 but it does not matter. You can imagine any size.

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