Question

Find the curved surface area of a cone whose base radius is $5.6cm$ and slant height is $9$ cm.

Answer 1

We know that formula of the curved surface area of a cone is $\pi rl$, where $r$ is the base radius and $l$ is the slant height of the cone.

Here, given the base radius, $r=5.6cm$

slant height, $l=9cm$

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

$=\frac{22}{7}\times 5.6\times 9=\frac{1108.8}{7}=158.8{cm}^2.$