Sebuah balok memiliki ukuran panjang 10 cm, lebar 7 cm dan 5 cm luas permukaan balok tersebut adalah?
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• Luas permukaan
LP = 2 × ((p × l) + (p × t) + (l × t))
LP = 2 × ((10 × 7) + (10 × 5) + (7 × 5))
LP = 2 × (70 + 50 + 35)
LP = 2 × (120 + 35)
LP = 2 × 155
LP = 310 cm²
LP :
= 2(10(7) + (10(5) + (7(5)
= 2(70 + 50 + 35)
= 2(155)
= 310 CM²