1103107010

Let $ABCDEF{A}^{\prime }{B}^{\prime }{C}^{\prime }{D}^{\prime }{E}^{\prime }{F}^{\prime }$ be a regular hexagonal prism with the base edge length of $4\mathrm{cm}$ and the height of $8\mathrm{cm}$. Find the distance between the points $E^{\prime }$ and $C$ (see the picture).