Question

The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs. 210 per l00 m2. 

Answer 1

Given that,
Slant height of conical tomb (l)=25m 

Base radius (r) of tomb = 14/2m=7 

CSA of conical length tomb = `pirl` 

=`(22/7xx7xx25)` 

= `550m^2` 

`"Cost of white – washing 100m^2 area=Rs.210"` 

`"Cost of white – washing 2 550 m area"=Rs.((210xx550)/100)` 

= Rs. 1155 

Thus the cost of white washing total tomb = Rs. 1155