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a=8cm
H= a
V=Pp*H
V=3a²√3*a/2
V=3a³√3/2
V=3*8³√3/2=3*512√3/2
V=768√3 cm³
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Pc=2Pp+Pb=3a²√3 +6aH=3a²√3+6a²=3a²(√3+2)
Pc=3*8²(√3+2)=3*64(√3+2)
Pc=192(√3+2) cm²