radius = 3 feet
rearrange the formula making r the subject
πr³ = V ( multiply both sides by 3 to eliminate fraction )
4πr³ = 3V ( divide both sides by 4π )
r³ = = ( 3 × 36π ) / 4π = 3 × 9 = 27
take the cube root of both sides
r = = 3
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πr³ = V ( multiply both sides by 3 to eliminate fraction )
= ( 3 × 36π ) / 4π = 3 × 9 = 27![\sqrt[3]{27}](https://img.qammunity.org/2019/formulas/mathematics/middle-school/7p82cbxa7bxbcnxouykbnz5gus83y6o1mg.png)
= 3