If you open math book you will find a lot of mathematical
questions butyou should have solve this question.
It is from class 10 rd sharma chapter 16 mensuration .
In this question we have to find the canvas required for
the tent given that a tent consists of a frustum of a
cone capped by a cone. If radii of the ends of the frustum
be 13 m and 7 m, the height of frustum be 8 m and the slant
height of the conical cap be 12 m.