Question

the radius of a cone is 3 cm and vertical height is 4 cm find the area of the curved surface​

Answer 1

Answer:

Hello mate✌✌✌

Given,

r = 3 cm

l = 4 cm

Now,

$</strong><strong>CSA</strong><strong> \: of \:cone \: = \pi \times r \times l \\ </strong><strong>CSA</strong><strong> \: of \: cone \: = \frac{22}{7} \times 3 \times 4 \\ </strong><strong>CSA</strong><strong> \: of \: cone \: = 37.71 \: {cm}^{2}$

Hope it helps✌✌✌

Answer 2

CSA of cone is

$\pi \: r l$

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

$l = \sqrt{ {4}^{2} + {3}^{2} }$

$l = \sqrt{16 + 9}$

$l = \sqrt{25}$

$l = 5 \: cm$

$\pi = 3.14$

$3.14 \times 4\times 3$

$3.14 \times 12$

$37.68 \: {cm}^{2}$