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r tabung = r bola = r
t tabung = d tabung = 2r
maka
Vb : Vt
4/3 πr³ : πr²t
4/3 πr³ : πr².2r
4/3 πr³ : 2 πr³ -----> pancung πr³ krn sama
4/3 : 2
4 : 6
2 : 3
Jadi Vb:Vt=2:3