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p = 15 cm
l = 6 cm
t = 4 cm
LP = 2(p × l) + 2(p × t) + 2(l × t)
= 2(15 × 6) + 2(15 × 4) + 2(6 × 4)
= 2(90) + 2(60) + 2(24)
= 180 + 120 + 48
= 348 cm²
Jadi luas permukaan prisma persegi panjang (balok) tersebut adalah 348 cm² (tidak ada jawabannya).