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kel. balok = 4(p+l+t)
= 4(10+6+4)
= 4(20)
= 80 cm
panjang kawat = 9,6 m diubah jadi cm = 960 cm
jadi panjang kawat / panjang kerangka balok
= 960 cm / 80 cm
= 12 kerangka