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V=1/3 *Pp*H
18√3=1/3 *Pp*4 /:(4/3)
54√3/4=Pp
Pp=3a²√3 /2
54√3/4=3a²√3/2 /:√3
54/4=3a²/2 /*2
27=3a²
a²=9
a=3