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p.kawat
= 4(p+l+t)
= 4(25+20+10)
= 4(55)
= 220 cm
jadi, sisa kawat
= 500 cm - 220 cm
= 280 cm
L = 4 (25 + 20 + 10)
= 4 x 55
= 220 cm
Panjang kawat untuk membuat 2 kerangka balok = 2 x 220 = 440 cm
Panjang kawat yang tersedia = 5 m = 500 cm
Jadi sisa kawat = 500 - 440 = 60 cm ( Jawab: C)