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Lp balok = 296
2(pl+pt+lt) = 296
pl+pt+lt = 296:2
12.10+12.t+10.t = 148
120+12t+10t = 148
120+22t = 148
22t = 148-120
22t = 28
t = 28:22
t = 1,27 cm
2)
p kawat
= 4(p+l+t)
= 4(25+15+6)
= 4(46)
= 184 cm