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V1 = volume bola 1
V2 = Volume bola 2
r = jari2 bola 1 = 3cm
R = jari2 bola 2 = 6 cm atau 2r
maka
V1 : V2
4/3πr³ : 4/3πR³
4/3πr³ : 4/3π(2r)³
4/3πr³ : 4/3πr³ 8
1 : 8
Jadi V1:V2=1:8