2a=20cm
a=10cm
H (a|3)=10|3
Pc= 2Pp+Pb
Pc= 2*6^2+4*(10|3 *6)= 2*36+720=72+720=792cm^2
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2a=20cm
a=10cm
H (a|3)=10|3
Pc= 2Pp+Pb
Pc= 2*6^2+4*(10|3 *6)= 2*36+720=72+720=792cm^2