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2πr = 4π
r - promien kola = 4π/2π = 2
V - objętość kuli = 4/3πr³ = 4π2³/3 = 4π8/3 = 32π/3
3V = 32π/3 razy 3 = 32π
odp
objętość trzech kul = 32π