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108cm² = 2{ (p×3cm) + (3cm×6cm) + (p×6cm)}
108cm² = 2 (3p + 18cm²+ 6p)
108cm² = 9p+ 36cm²
9p = 108cm²-36cm²
9p= 72cm²
p = 72 cm²/9
p = 8cm
2(pl+pt+lt)
2(3p+6p+18)
9p=36
p=36/9
p=4 cm
Check Luas Permukaan Balok jika panjang,lebar,dan tinggi diketahui semua
Luas Permukaan =
2(pl+pt+lt)
2(4.3+4.6+3.6)
2(12+24+18)
2(54)
=108 cm