Pc=2Pp+Pb
Pp=8*8=64 cm²
2Pp=2*64=128 cm²
Pb=8*8*4=256 cm²
Pc=128+256=384 cm²
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Ppc=6a²
Ppc=6*8²
Ppc=6*64
Ppc=384 cm²
Pc=2Pp+Pb
Pp=8*8=64 cm²
2Pp=2*64=128 cm²
Pb=8*8*4=256 cm²
Pc=128+256=384 cm²