ICSE Board Question Based on Mensuration Chapter of M.L Aggarwal for class10
In this question slant height and base diameter of a conical tomb is given.
Find the cost of white washing its curved surface area at the rate of Rs 210 per 100 m square.
This is the Question Number 10, Exercise 17.2 of M.L Aggarwal.
Deepak BoraNewbie
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 area at the rate of Rs 210 per 100 m square.
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Given slant height of conical tomb, l = 25 m
Base diameter, d = 14 m
So radius, r = 14/2 = 7 m
Curved surface area = rl
= (22/7)×7×25 = 550 m2
Hence the curved surface area of the cone is 550 m2.
Rate of washing its curved surface area per 100 m2 = Rs. 210
So total cost = (550/100)×210 = Rs. 1155
Hence the total cost of washing its curved surface area is Rs. 1155.