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V2 = phi x 100 x t
pebandingan v1/v2 = 1/4 = 1 : 4
V1 = 1177,5
V2 = 4710
memakai phi = 3,14
selisih = V2-V1 = 4710 - 1177,5 = 3532,5 cm3
volume 2=Π×10×10×15
perbandingan vol 1 dan 2 adl 1:4
selisih vol 2 dengan 1 adl 4-1=3