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25x5x2=250
18x5x2=180
jumlah=900+250+180=1330
Luas minimal = 2 (pl + pt + lt)
Luas minimal = 2 (25×18 + 25×5 + 18×5)
Luas minimal = 2 (450 + 125 + 90)
Luas minimal = 2 (665)
Luas minimal = 1.330 cm²