Question

24. Diameter of the base of a cone is 0.5 cm and its slant height is 10 cm. find its curved surface
area.​

Answer 1

Answer:-

Curved Surface Area Of The Given Cone Is 7.85 cm².

Explanation:-

Given:-

• Diameter of the base = 0.5 cm.

• So Radius (r) = $\tt\dfrac{0.5}{2}\:cm$

• Slant height (l) = 10 cm.

Formula Used:-

$\large\bf\mapsto s = \pi\times r\times l.$

Where,

• S = Curved Surface Area.

Solution:-

By Putting the values in formula,

$\\ \tt\mapsto s = \pi \times r \times l.$

$\\ \tt\mapsto s = 3.14 \times 0.25 \: cm \times 10 \: cm.$

$\\ \tt\mapsto s = 31.4 \: cm \times 0.25 \: cm$

$\\ \large \underline{\boxed{\bf\mapsto s = 7.85 \: cm {}^{2} }}$

Therefore CSA of the cone is 7.85 cm².

Answer 2

Given :-

Diameter = 0.5 cm

Slant Height = 10 cm

To Find :-

CSA

Solution :-

Radii = D/2

R = 0.5/2

R = 0.25 cm

Now

$\sf CSA = \pi r l$

CSA = 22/7 * 0.25 * 10

CSA = 22/7 * 2.5

CSA = 7.85 cm^2