Question

Find the curved surfae area of a right circular cone with 3 cm radius and 4cm height

Answer 1

radius=3 cm

and, height= 4 cm

curve surface area of cone = πrl

now we have to find ,l

so,

$l = \sqrt{ {r}^{2} + {h}^{2} }$

$l = \sqrt{ {3}^{2} + {4}^{2} } \\ = \sqrt{9 + 16 } \\ = \sqrt{25} \\ = 5cm$

CSA of cone =

$csa \: of \: cone \: = \pi \: rl \\ = \frac{22}{7} \times 3 \times 5 \\ = \frac{330}{7} \\ = 47.14 {cm}^{2}$

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