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![972\pi = \frac{4}{3} \pi r^3\\972 = \frac{4}{3} r^3\\4r^3 = 972 \times 3\\ 4r^3 =2916\\r^3 = \frac{2916}{4}\\r^3= 729\\r=\sqrt[3]{729}\\r= 9mm](/tpl/images/0361/2042/a41ef.png)
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