V=S*h, S=6*a^2/(4*tg(2*Pi/12))=6*a^2/(4*tg(Pi/6))=6*a^2/(4* 1/sqrt(3)) =3/2* a^2*sqrt(3)
V= 3/2* a^2*sqrt(3) *h
V=S*h, S=6*a^2/(4*tg(2*Pi/12))=6*a^2/(4*tg(Pi/6))=6*a^2/(4* 1/sqrt(3)) =3/2* a^2*sqrt(3)
V= 3/2* a^2*sqrt(3) *h