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s = 6 cm
s -> panjang rusuk
Lp = 6 x s²
= 6 x 36 = 216 cm
jumlah panjang semu rusuk = 72 cm
jumlh rusuk = 12 buah
maka:
panjang rusuk = 72/12 = 6 cm
Lp = 6 x 6²
= 216 cm³