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112 = 14 × l
112 = 14l
8 = l
LP = 2(p × l) + 2(p × t) + 2(l × t)
= 2(14 × 8) + 2(14 × 5) + 2(8 × 5)
= 2(112) + 2(70) + 2(40)
= 224 + 140 + 80
= 444 cm²
Jadi luas permukaan balok tersebut adalah 444 cm²
= 14 x 5 x 2 = 140 cm²
= (112:4) x 5 x 2 = 8 x 5 x 2 = 80 cm²
= 224 cm² + 140 cm² + 80 cm² = 484 cm²
Maaf kalau salah