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Pk - pole koła
V - objętość kuli
r - promień wielkiego koła i promień kuli
Pk = πr²
Pk = 12π
πr² = 12π /: π
r² = 12
r = √12
V = ⁴/₃πr³
V = ⁴/₃π(√12)³ = ⁴/₃π*12√12 = 16π√12 = 16π√4*3 = 16π* 2√3 = 32√3π
Odp. Objętość kuli wynosi 32√3π.