Question

Find the curved surface area of a cone with a radius of $4.9cm$ and a slant height of $14cm$.

• A. $225.6{cm}^2$
• B. $235.6{cm}^2$
• C. $215.6{cm}^2$
• D. $245.6{cm}^2$

Answer 1

The correct option is C $215.6{cm}^2$

We know, the curved surface area of a right circular cone $=\pi rl$.

Given, radius of the cone $=4.9cm$.

Also, given slant height $l=14cm$.

Then, the curved surface area $=\pi \times 4.9\times 14$

$=\frac{22}{7}\times 4.9\times 14$ $=215.6{\text{cm}}^2$.

Therefore, option $C$ is the correct.