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b=9cm
H=20cm h=4cm
Pp=1/2 *h*(a+b)
Pp=1/2*4*(3+9)
Pp= 2*12(bo skracasz 2 z 4)
Pp=24cm 2
P1=a*b
P1=3*9 Pb=2*27+60
P1=27cm2
P2=a*H
P2=3*20
p2=60cm2
Pb=2*P1+P2
Pb=54+60
Pb=114cm2
Pc=2*Pp+Pb
Pc=2*24+114
Pc= 48+114
Pc=162cm2