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  • The circumference of the base of the cone is 220/7and slant height is 13cm find volume of the cone . (use pie=22/7)

The circumference of the base of the cone is 220/7and slant height is 13cm find volume of the cone . (use pie=22/7)

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circumference = 2πr = 220/7
\begin{array}{l} \Rightarrow 2 \times(22 / 7) \times r=220 / 7 \\ \Rightarrow r=5 cm \\ l=13 cm \\ \text { height }=\sqrt{l^{2}-r^{2}} = \sqrt{ 13^{2}-5^{2}} = \ \sqrt{144}=12 cm \\ \text { Volume }=(1 / 3) \pi r^{2} h=(1 / 3) \times(22 / 7) \times 5^{2} \times 12=314.28 cm \end{array}

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Deependra Verma

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