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= 4 *18 + 4*10 + 4*7
= 72 + 40 +28
= 140 cm
2. dikertahui panjang kawat = 8.5 m = 850 cm
untuk kerangka balok = 4 Panjang + 4 lebar + 4 tinggi
= 4*19 + 4*10 + 4*6
= 76 + 40 + 24
=140,
sisa = 850 - 140 = 710 cm