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v balok = p × l × t = 18 × 9 × 10 = 1.620 cm^3
v limas = 1/3 × La × t = 1/3 × 81 × 10 = 270 cm^3
V gabungan = 1.890 cm^3
l = 2/3 × 9 = 6 cm
V balok = p × l × t
648 = 9 × 6 × t
648 = 54 ×t
t = 648 ÷ 54 = 12 cm
perbandingan = p : l : t = 9 : 6 : 12 = 3 : 2 : 4