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  4. The curved surface area (in mathrmcm2 ) of a cone frustum whose slant height is 14 mathrm~cm and the top and bottom radii are 12 mathrm~cm and 8 mathrm~cm, respectively is

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Q. The curved surface area (in $\mathrm{cm}^2$ ) of a cone frustum whose slant height is $14 \mathrm{~cm}$ and the top and bottom radii are $12 \mathrm{~cm}$ and $8 \mathrm{~cm}$, respectively is ___

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Solution:

The curved surface area of a cone $=\pi(R+r) l$
Given: $R=12, r=8$, and $l=14$
$\operatorname{CSA}=\pi(12+8)(14)=880 \pi \mathrm{cm}^2$