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tinggi = 3 x volume / Luas alas
tinggi = 3x1000 / (20x10)
tinggi = 3000/200 = 15 cm
Volume total balok = 20x10x15 = 3.000 cm³
Volume balok diluar limas = 3.000 cm³ - 1.000 cm³ = 2.000 cm³