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4/3 x phi x r^3 = 4 x phi x r^2
4/3 r = 4
r = 4 x 3/4
r = 3
udah. gitu aja menurut aku
4/3 x phi x r3 = 4 x phi x r2
4/3r = 4
r = 4/3 × 4
r = 3