luas permukaan balok
Luas satu
=p×l
=30 cm×15 cm
=450 cm²×2
=900 cm²
Luas dua
=15 cm×12 cm
=180 cm²×2
= 360 cm²
Luas tiga
=30 cm×12 cm
=360 cm²×2
=720 cm²
jumlah keseluruhan
=900 cm²+360 cm²+720 cm²
=1980 cm²
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luas permukaan balok
Luas satu
=p×l
=30 cm×15 cm
=450 cm²×2
=900 cm²
Luas dua
=15 cm×12 cm
=180 cm²×2
= 360 cm²
Luas tiga
=30 cm×12 cm
=360 cm²×2
=720 cm²
jumlah keseluruhan
=900 cm²+360 cm²+720 cm²
=1980 cm²