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pisah jadi 2 bangun
v.bangun 1(balok) = 6 x 20 x 1 = 120
v.bangun 2( karena masih benuk segi 3. dijadiin balok duluu terus bagi 2) = 6 x 20 x 3 / 2 = 180
jumlahkan v.b 1 + v.b 2
120 + 180 = 300 m³
= 300.000 liter