How many metres of plastic sheet, $5 m$ wide, will be required to make a conical tent, the radius of whose base is $7 m$ and height is $24 m$ ?

210 m

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110 m

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111 m

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100 m

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Solution

The correct option is D $110 m$
$l^{2} = 24^{2} + 7^{2} = 525$
$l = 25$
Area of rectangle $= 5 l$
Curved surface area of cone $= π (7) (25) = 550$
$l = \frac{550}{5} = 110 m$

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