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Pp=a*h/2
h=(a*√3)/2
Pp={[(5*√3)/2]*5}/2=[(25√3)/2]/2=25√3
H=5^2-(1/2*h)^2=25-1/4h^2=25-[(1/4)*(75/2)]=
=25- (9 i 3/8)=(15 i 5/8)
V=1/3*(25√3)*[15 i 5/8]
V=225,5