The circumference of the base of a right circular cone is 44 cm and its height is 24 cm. The curved surface area (in cm2) of the cone is:

Answer: Option C

Solution

Answer: Option C

Solution:

$$\begin{array}{rl}& 2\pi r=44\\ & 2\times \frac{22}{7}\times r=44\\ & r=7\\ & \text{Curved surface area}=\pi rl\\ & =\frac{22}{7}\times 7\times 25\\ & =550\text{ c}{\text{m}}^2\end{array}$$