Find the curved surface area of a cone with base radius $5.25\ cm$ and slant height $10\ cm$.

 Given:

The base radius of a cone is $5.25\ cm$ and the slant height is $10\ cm$.

To do:

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

Solution:

Radius of the base of the cone $(r) = 5.25\ cm$

Slant height of the cone $(l) = 10\ cm$

Therefore,

Curved surface area of the cone $= \pi rl$

$=\frac{22}{7} \times 5.25 \times 10$

$=\frac{22 \times 52.5}{7}$

$=22 \times 7.5$

$=165 \mathrm{~cm}^{2}$

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Updated on: 10-Oct-2022

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