7. Find the height of the kulfi

A kulfi is in the form of a frustum of a cone with a capacity of 62.81 \(cm^3\). The radii of the top and bottom circular ends are 0.5 \(cm\) and 2.1 \(cm\), respectively. Find the height of the kulfi.

 

 

The height of the kulfi \(=\)  \(cm\).