I want to know the best answer of the question from Surface areas and Volumes chapter of class 9th ncert math. The question from exercise 13.3 of math. Give me the easy way for solving this question of 6 The slant height and base diameter of conical tomb are 25m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs. 210 per 100 m2. (Assume π = 22/7)
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The slant height and base diameter of conical tomb are 25m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs. 210 per 100 m2. (Assume π = 22/7) Q.6
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Slant height of conical tomb, l = 25m
Base radius, r = diameter/2 = 14/2 m = 7m
CSA of conical tomb = πrl
= (22/7)×7×25 = 550
CSA of conical tomb= 550m2
Cost of white-washing 550 m2 area, which is Rs (210×550)/100
= Rs. 1155
Therefore, cost will be Rs. 1155 while white-washing tomb.