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jari2 bola = jari2 tabung = r
t tabung = diameter bola = 2r
Maka :
Vtabung : Vbola
πr²t : 4/3 πr³
πr²(2r) : 4/3 πr³
2πr³ : 4/3 πr³ <----coret πr³ krn udah sama
2 : 4/3
6 : 4
3 : 2
Jadi Vtabung: Vbola=3:2