Pc=2Pp+Pb
a) Pb=3*(3*8)=3*24= 72
b) Pb=3*(4*6)=3*24=72
Pc=2*6+72=12+72= 84cm2
c) Pb=2*(3*9)+2*(7*9)=2*27+2*63=54+126=180
Pc=2*15+180=30+180= 210cm2
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Pc=2Pp+Pb
a) Pb=3*(3*8)=3*24= 72
b) Pb=3*(4*6)=3*24=72
Pc=2*6+72=12+72= 84cm2
c) Pb=2*(3*9)+2*(7*9)=2*27+2*63=54+126=180
Pc=2*15+180=30+180= 210cm2
Powinno być ok
Pozdrowionka! ~Wika