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panjang kotak 15cm
dit lp
kita cari lebar dan tinggi
lebar= 15 ÷ 3 × 2
lebar= 10cm
tinggi= 15÷3×4
tinggi= 20cm
luas permukaan balok :
15×10 = 150
15×20 = 300
10×20 = 200
150+300+200=650
650×2=1.300cm²
maaf kalo salah
luas permukaan balok = 2×(pxl) + 2×(pxt) + 2×(lxt)
= 2×(15×10) + 2×(15×20) + 2×(10×20)
= 2×150 + 2×300 + 2×200
= 300 + 600 + 400
= 1300