The slant height and base diameter of a conical tomb are 25m and 14m respectively. Find the cost of white-washing its curved surface at the rate of Rs.210 per 100m2.
Given:
Slant height,l=25mand, diameter =14 m
So, radius, r=142 m=7m, ⇒Curved surface area =πrl
=(227×7×25)m2
=550m2
⇒Cost of white washing 100m2 area = Rs.210
⇒Cost of white washing 550m2 area = Rs. 210×550100
= Rs.1155
Hence, the cost of white washing is Rs.1,155