21. Find the height and the curved surface area of the frustum

The slant height of a frustum of a cone is 10 $cm$. The diameter of the lower and upper circular ends are 26 $cm$ and 14 $cm$. Find the height and the curved surface area of the frustum. [Use $\pi = 3.14$]

 

Height of the frustum of a cone $=$  $cm$

 

Curved surface area of the frustum of a cone $=$  $cm^2$