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panjang kawat = 3,5 m = 350 cm
rusuk = 27,5 cm
mka :
R = 12 x rusuk
= 12 x 27,5
= 330
jadi pnjng kawat y tersisa = 350 - 330 = 20 cm
panjang kerangka kubus = 12s = 12 x 27,5 = 330 cm
panjang kawat yg tidak terpakai = 350 - 330 = 20 cm