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P1=3cm*2cm=6cm2
P2=2cm*4cm=8cm2
P3=3cm*4cm=12cm2
Pc=6cm2*2+8cm2*2+12cm2*2=12cm2+16cm2+24cm2=52cm2
Pp=3cm*0,02cm+3cm*4cm+4cm*0,02cm
Pp=0,06cm+12cm=0,08cm
Pp=12,14cm2
Pc = 3 x 4 + 4 x2 + 3 x 2= 12 +8 + 6 = 26 x 2 = 52cm ²