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a=3cm
Pp=a^2=3^2=9cm^2
Pc=Pp+4Ps=9+4(1/2*3*h)=9+6h
27=9+6h
6h=18
h=18/6=3cm
jako że h=a to:
H=3√2cm
V=1/3*Pp*H=1/3 * 9 * 3√2=9√2 cm^3