Question

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

• A. 60π cm²
• B. 68π cm³
• C. 120π cm²
• D. 136π cm²
• E. 146π cm²

Answer 1

The correct option is D

136π cm²

h = 15 cm, r = 8 cm.

So, l = $\sqrt{r^2+h^2}=\sqrt{8^2+{\left(15\right)}^2}=17cm$

$\therefore$Curved surface area = $\pi$rl = ($\pi$$\times$8$\times$17) cm${}^2$= 136$\pi$ cm${}^2$