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= 12 × 5 + 6 × 20
= 60 + 120
= 180cm
kira kira begitu '-'
Jadi panjang rusuk alas dan tutupnya = 12 x 5 = 60 cm
panjang rusuk sisi tegaknya = 6 x 20= 120 cm
Jadi jumlah rusuk seluruhnya = 120 cm + 60 cm = 180 cm
Maaf kalau ada kesalahan