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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.
Solution
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
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