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Prosze:)
Vszescianu=a^3
Vk=Vszescianu
(4*pi*r^3)/3=a^3
r^3=a^3/(4*pi/3)
r=sqrt3(a^3/(4*pi/3))
4/3πr3=1m³
4πr³=3m³
r³=3m³/4π
r=√3/4π m