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 mBase diameter, d = 14 mSo radius, r = 14/2 = 7 mCurved surface area = rl= (22/7)×7×25 = 550 m^{2}Hence the curved surface area of the cone is 550 m^{2}.Rate of washing its curved surface area per 100 m^{2}= Rs. 210So total cost = (550/100)×210 = Rs. 1155Hence the total cost of washing its curved surface area is Rs. 1155.