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H=2n+½*2n=2n+n=3n
Pc=2Pp+Pb
Pp=a²
Pp=(2n)²=4n²
Pb=4aH
Pb=4*2n*3n=24n²
Pc=2*4n²+24n²=8n²+24n²=32n²
V=PpH
V=4n²*3n=12n³