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= phi.r.r.t - 1/3.phi.r.r.t
= 3.14x10x10x15 - 1/3x3.14x10x10x15
(utk yg V.kc angka 3 di 1/3 dicoret dg angka 15)
= 4710 - 1570
= 3140 dm kubik = 3140 liter