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10 x 1 1/2 = 15 cm
8 x 1 1/2 = 12 cm
volume balok mula2 = 12x10x8 = 960 cm3
volume balok stlh diperpanjang = 18x15x12 = 3.240 cm3
→3.240 - 960 = 2.280 cm3
maaf kalau salah:)