12. Determine the curved surface area of the frustum

The perimeters (circumference) of circular ends of the frustum of a cone are 16 \(cm\) and 10 \(cm\), and the slant height is 9 \(cm\). Find the curved surface area of the frustum.

 

The curved surface area of the frustum \(=\) 96226117234 \(cm^2\).