V=900cm³
V=⁴/₃πr³
⁴/₃πr³=900cm³
4πr³=2700cm³
πr³=675cm³
r³=675/π cm³
r=∛675/π cm
r=3∛25/π cm
Ppc=4πr²
Ppc=4·π·(3∛25/π cm)²=4π·9∛625/π² cm²=180π∛5/π² cm²
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V=900cm³
V=⁴/₃πr³
⁴/₃πr³=900cm³
4πr³=2700cm³
πr³=675cm³
r³=675/π cm³
r=∛675/π cm
r=3∛25/π cm
Ppc=4πr²
Ppc=4·π·(3∛25/π cm)²=4π·9∛625/π² cm²=180π∛5/π² cm²