NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.3 – Part 2
Slant height l or s =
Q4 A conical tent is high and the radius of its base is . Find

Slant height of the tent.

Cost of the canvas required to make the tent, if the cost of canvas is
Solution(I):

Radius of the base (r)

Height of the conical tent (h)
Therefore, the slant height of the cone is .
Solution(II):
Canvas required to make the conical tent is the curved or lateral surface of the cone. Note that the tent does not have a base. Also, cost of canvas
Area of canvas = ( )
Therefore, cost of canvas = Rs.
5. What length of tarpaulin wide will be required to make conical tent of height and base radius ? Assume that the extra length of material that will be required for stitching margins and wastage in cutting is approximately (Use ).Solution:

Radius of the base (r)

Height of the conical tent (h)
Now, l is the slant height of the cone
Curved surface area of conical tent =
We know that breadth of tarpaulin . Let, is length of tarpaulin sheet required of which we know from the problem that will be wasted in cutting. So, the actual length used will be . Now area of this sheet with length and breadth of 3m must match the lateral surface area of the sheet,
That is,