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a-40cm. b-60cm
Ob=80cm+120cm
Ob=200cm
60*200 cm= 12000cm
40 cm * 2= 80cm
60 cm*2=120cm
Ob=2*a+2*b
Ob=2*80 cm + 2*120 cm
Ob=400 cm
400 cm * 36= 14400cm
12000cm+14400xm=26400cm
26400cm= 264m
Odp.Wykorzystano264 m listewki