The curved surface of a right circular cone of height 15 cm and base diameter 16 cm is :

Answer: Option D

h = 15 cm, r = 8 cm
So,
$$\begin{array}{rl}& l=\sqrt{r^2+h^2}\\ & =\sqrt{8^2+{\left(15\right)}^2}\\ & =17cm\end{array}$$
∴ Curved surface area :
$$\begin{array}{rl}& =\pi rl\\ & =\left(\pi \times 8\times 17\right)\text{ c}{\text{m}}^2\\ & =136\pi \text{ c}{\text{m}}^2\end{array}$$