The radius of a right circular cone is 3 cm and its height is 4 cm

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RRB TA Exam (Malda) 2008 click here to view all questions

The radius of a right circular cone is 3 cm and its height is 4 cm. The curved surface of the cone will be

A$$12 \pi \text{ sq.cm}$$

B$$15 \pi \text{ sq.cm } $$

C$$18 \pi \text{ sq.cm }$$

D$$ 21 \pi \text{ sq.cm} $$

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Answer is $15 \pi \text{ sq.cm }$ Explanation: Slant height of the cone $l = \sqrt{r^2+h^2}$ = $\sqrt{3^2+4^2}$ = $\sqrt{9+16}$ =$\sqrt{25}=5 \text { cm}$ $\therefore$ Area of the curved surface = $\pi rl$ $=\pi \times3\times5$ $= 15 \pi \text{ sq.cm}$ balakrishna ? answered Jul 2 '2017 at 11:27 All Comments

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