How many square metres of canvas is required for a conical tent whose height is $3.5 m$ and the radius of the base is $12 m$ ?

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Solution

$\begin{matrix} S l a n t h e i g h t 5 l = \sqrt{h^{2} + r^{2}} = \sqrt{{(3.5)}^{2} + {(12)}^{2}} t o t a l c a n v a s r e q u i r e d = π r l = π \times 12 \times 12.5 = 471 m^{2} \end{matrix}$

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How many square meters of a canvas is required for a conical tent whose height is 3.5 m and the radius of the base is 12 m?

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