Assuming your looking for volume.
The following formula is used for calculating the volume (V) of a cone.
[tex]\boxed{V=\frac{1}{3}\pi r^{2} h}[/tex]
⇒ [tex]V=\frac{\pi *3^{2} *&5}{3} =\frac{45*\pi }{3}[/tex] ≈ [tex]47.124[/tex] [tex]cubic[/tex] [tex]cm[/tex]