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panjang = 20 cm
lebar = 12 cm
tinggi = 9 cm
maka :
Jumlah rusuk = (4x20) + (4x12) + (4x9)
= 80 + 48 + 36
= 164 cm
lebar=12 cm
tinggi=9 cm
maka:
jumlah rusuk=[4*20]+[4*12]+[4*9]
=80+48+36
=164 cm