Question

# Diameter of the base of a cone is 10.5cm and its slant height is 10cm. Find its curved surface area.

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Hint: Slant height of a cone is the line joining the vertex to any point on a circular edge of the base.

Now, they have given us the diameter of the base of a cone as $d = 10.5cm$
And, therefore, radius of the base of cone will be $r = 5.25cm$
And, the slant height given is $\ell = 10cm$
The formula to find the curved surface area of the cone, $A = \pi r\ell$
$A = \dfrac{{22}}{7} \times 5.25 \times 10$
$A = 165c{m^2}$
Answer= the curved surface area of the given cone is n$165c{m^2}$