a) Pp=6cm*3cm=18cm2
Pb1=12cm*6cm=72cm2
Pb2=12cm*3cm=36cm2
Pc=2*18cm2+2*72cm2+2*36cm2=36cm2+144cm2+72cm2=252cm2
Obj=12cm*6cm*3cm=216cm3
b)Pp=4*6/2=12[cm2]
Pb1=5*12=60[cm2]
Pb2=6*12=72[cm2]
Pc=2*12+2*60+72=24+120+72=216[cm2]
c) Pp=5*3=15[cm2]
Pb=5*12=60[cm2]
Pc=15+60=75[cm2]
d) P=a+b/2*h
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a) Pp=6cm*3cm=18cm2
Pb1=12cm*6cm=72cm2
Pb2=12cm*3cm=36cm2
Pc=2*18cm2+2*72cm2+2*36cm2=36cm2+144cm2+72cm2=252cm2
Obj=12cm*6cm*3cm=216cm3
b)Pp=4*6/2=12[cm2]
Pb1=5*12=60[cm2]
Pb2=6*12=72[cm2]
Pc=2*12+2*60+72=24+120+72=216[cm2]
c) Pp=5*3=15[cm2]
Pb=5*12=60[cm2]
Pc=15+60=75[cm2]
d) P=a+b/2*h