Question

express volume of sphere in terms of diameters

Answer 1

$v = (4 \div 3)\pi {r}^{3} \\ d = 2r \\ v = (4 \div 3)\pi(d \div 2) {}^{3} \\ v = (4 \div 3)\pi {d}^{3} \div 8$
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Answer 2

volume of sphere = 4/3πr³
in terns of dianeter = (4/3)π(d/2)³
=(2/2)πd³