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b=11cm
V=Pp*H/3
H=?
H²=b²-a²
H²=11² -6² =121 -36 =85
H=√85cm
Pp=3a²√3/2
Pp=3*6²√3/2 =3*36√3/2
Pp=54√3 cm²
V=54√3*√85/3
V=18√255 cm³