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L balok = 12 x 6 + 2(6 x 3) + 2(12 x 3)
= 72 + 36 + 72
= 180 cm²
Luas Prisma = 2(Luas alas) + Luas Selubung
= 2(1/2 . 6 . 4) + 2(5 x 12)
= 24 + 120
= 144 cm²
Luas Bangun = I + II = 180 + 144 = 324 cm²