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Question

A tent is of the shape of a right circular cylinder upto a height of 3 m and then becomes a right circular cone with a maximum height of 13.5 m above the ground. Calculate the cost of painting the inner side of the tent at the rate of Rs. 2 per sq m, if the radius of the base is 14 m.

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Solution


Surface area to be painted = πrl+2πrh1
= πr(r2+h2+h1)
= 227×14(142+10.52+3)
= 44 × 20.5
= 902m2
Total cost of painting = Rs. (902×2)
= Rs. 1804

946688_563960_ans_8f355988c4da495a821eddac91185561.jpg

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