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πr²t = πr²t + πr³
π.8².t = π.8².15 + .π.6³
64π.t = 960π + 288π
64π.t = 1248π
t =
t = 19.5
πr²t = 4/3 πr³
π8²t= 4/3 π6³
64πt=288π
t=288π / 64π
t=4,5 cm
Tinggi air dalam tabung = 15 cm+4,5 cm=19,5 cm