(Q2) The radius of a conical tent is 7m and its height is 10m.Calculate the length of canvas used in making the tent, if the width of canvas is 2m.

[ π =
22
7
 ]

Solution :

10m7m

The radius of conical tent is (r) = m and height(h) = m

∴ So, the slant height of the cone l2 = r2 + h2

⇒ l = √(r2 + h2)

  = √( + ) = √ = m

Now, surface area of the tent = πrl

=
× × m2

= m2

Area of canvas used = m2

It is given that the width of the canvas = m

Length of canvas used =
Area
Width
 =
= m