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r₂ = 2
V₁ = 4/3πr₁³ = 64*4/3π = 85⅓π
V₂ = 4/3πr₂³ = 8*4/3π = 10⅔π
V₁+V₂ = V₃
85⅓π+10⅔π = 96π
4/3πr³ = 96π /*3
4r³ = 288 /:4
r³ = 72
r = ³√72
r = 2³√9
Średnica = 2³√9*2 = 4³√9