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Pp=a²√3/4
a² =4Pp/√3
a² =4*81√3/√3
a=√(4*81)
a=2*9
a=18
tgα =H/a
H=a*tgα
H=18*1/2
H=9
V=Pp*H
V=81√3*9
V=729√3 [j³]
Pb=3aH
Pb=3*18*9
Pb=486 [j²]