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Pp=10m*15m=150m²
Pb=2*10m*0,35m+2*15m*0,35m=7m²+10,5m²=17,5m²
Pc=Pb+Pp=167,5m²
P=20cm*30cm=0,2m*0,3m=0,06m²
n=167,5m²/0,06m²=2791,67
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