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t=4r
Vtabung : V2bola
πr²t : 2. 4/3 πr³
πr²4r : 8/3 πr³
4πr³ : 8/3 πr³
12πr³ : 8 πr³
3 : 2
V luar bola =3-2=1
Jadi perbandingannya :
Vtabung: V2bola:Vluarbola=3:2:1