Question

A conical tent is 10M high and its base radius is 24 m.Then find the cost of canvas which is to be used for making the tent at the rate of
$rs70 \: per \: 1m {}^{2}$

Answer 1

h = 10 m, r = 24 m
Slant height(l) = sqrt(h^2 + r^2) = sqrt(100+ 576)
= sqrt(676) = 26 m

Curved Surface Area of Cone = pi x r x l
= 22/7 x 24 x 26 = 13728/7

Cost of 1 m^2 = 70 Rs.
Cost of 13728/7 m^2 = 70 x 13728/7
= 137280 Rs.