Find the curved surface area of a cone, if its slant height is $60\ cm$ and the radius of its base is $21\ cm$.

 Given:

The slant height of a cone is $60\ cm$ and the radius of its base is $21\ cm$.

To do:

We have to find the curved surface area of the cone.

Solution:

Curved surface area of the cone $=\pi r l$

$=\frac{22}{7} \times 21 \times 60$

$=22\times180$

$=3960 \mathrm{~cm}^{2}$

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Updated on: 10-Oct-2022

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