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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 100 m2.

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Solution

Slant height (l) of conical tomb = 25 m

Base radius (r) of tomb = 7 m

CSA of conical tomb = πrl

= 550 m2

Cost of white-washing 100 m2 area = Rs 210

Cost of white-washing 550 m2 area =

= Rs 1155

Therefore, it will cost Rs 1155 while white-washing such a conical tomb.


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