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v2 = 512
v1 = 3/4 π r^3 : v2 = 3/4 π r^3
64 = 3/4 π r^3 : 512 = 3/4 π r^3
64 = r^3 : 512 = r^3
r1 =4 : r2 = 8
jadi
r1 :r2
4:8
1:2