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Diameter of the base of a cone is $ 10.5 \mathrm{~cm} $ and its slant height is $ 10 \mathrm{~cm} $. Find its curved surface area.
Given:
Diameter of the base of a cone is \( 10.5 \mathrm{~cm} \) and its slant height is \( 10 \mathrm{~cm} \).
To do:
We have to find its curved surface area.
Solution:
We have the diameter of the base of the cone $=10.5\ m$
We know that,
Radius$=\frac{diameter}{2}$
This implies,
The radius of the base of the cone$=\frac{10.5}{2}$
$=5.25\ cm$
We also have the slant height of the cone $=10\ cm$
Therefore,
The curved surface area of the cone $=\pi r l$
$=\frac{22}{7} \times 5.25 \times 10$
$=\frac{22}{7}\times52.5$
$=165 \mathrm{~cm}^{2}$
Hence,
The curved surface area of the cone is $165 \mathrm{~cm}^{2}$.
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