Practice | Hashtable

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

A. 60π cm²

B. 68π cm²

C. 120π cm²

D. 136π cm²

Solution:

h = 15 cm, r = 8 cm
So,

\begin{aligned} l = \sqrt{r^{2} + h^{2}} \\ = \sqrt{8^{2} + {(15)}^{2}} \\ = 17 c m \end{aligned}

∴ Curved surface area :

\begin{aligned} = π r l \\ = (π \times 8 \times 17) c m^{2} \\ = 136 π c m^{2} \end{aligned}

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