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1dm=100mm
2cm=20mm
V=Pp*H
V=20mm*5mm*100mm
V=10000mm3
V=10cm3
Ppc=2*Pp+Pb
Ppc=2*20mm*5mm+2*20mm*100mm+2*5mm*100mm
Ppc=200mm+4000mm+1000mm
Ppc=5200mm2
Ppc=52cm2
b)
V=a3
V=(1,2cm)3
V=1,728cm3
Ppc=2*Pp+Pb
Ppc=2*1,2cm*1,2cm+2*1,2cm*1,2cm+2*1,2cm*1,2cm
Ppc=2,88cm2+2,88cm2+2,88cm2
Ppc=8,64cm2