Q16 of 63 Page 21

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.

We have,


Radius of conical tomb = diameter /2 = 14/2 = 7 m


Slant height = l = 25 m


Curved surface area = πrl


Cost of white washing = (curved surface area × rate of white washing per m2)


=


= = Rs.1155


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