The height of a tent is 9 m. It's base diameter is 24 m. What is its slant height. Find the approximate cost of canvas cloth required if it costs Rs. 14 per sq. m.
Given the base diameter of tent is d=24 m and height of a tent is h=9 m and the cost of canvas cloth is Rs. 14 per sq m.
Let slant height of tent be l, then
l2=r2+h2⇒l=√(12)2+(9)2=√225=15m.
Therefore, Area of canvas required = Curved surface area of the cone
=πrl=227×12×15=39607
Then, Cost of canvas =Rs.(39607×14)=Rs.7920.