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phi.r^2.t | 1/3.phi.r^2.t
r^2 | 1/3.r^2
3^2 | 1/3 . 3^2
3 . 3 | 1/3 . 3 . 3
9 | 3 -> disederhanakan
3 | 1
phi dan t dicoret
jadi, perbandingan Volume tabung dan kerucut adalah 3 : 1