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Q.

How much cloth 2.5 m wide will be needed to make a conical tent having base radius value 7 m and height value 24 m?


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a

210m

b

230m

c

260m

d

220m 

answer is D.

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Detailed Solution

Given, the base radius of a conical tent is 7 m and the height is 24 m.
We know that the curved surface area of the cone is πrr2+h2.
πrr2+h2
=π(7)72+242
=550 m3
The cloth required = curved surface area ÷ width of the cloth.
The cloth required = 5502.5=220 m.
Hence, option 4 is correct.
 
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