Question

find the curved surface area of a right circular cone whose slant height is 10 cm and radius is 7cm ​

Answer 1

$\huge \fbox \blue{Given:}$

➙ Slant height of a right circular cone = 10 cm

➙ Radius of a right circular cone = 7 cm

$\huge \fbox \blue{To \; Find :}$

➙ Curved Surface area of right circular cone

$\huge \fbox \blue{Solution:}$

➙ As we know that ,

Curved Surface area of a right circular cone = πrl

Where ,

r = radius

l = slant height

➙ Let's solve now !

$\sf \implies \dfrac{22}{7} \times 7\;cm \times 10 \; cm$

$\sf \implies 22 \times 10 \;$

$\sf \implies 220 \; cm^{2}$

∴ Curved Surface area is 220 cm²

$\huge \fbox \blue{More\; about \;cone:}$

❶ Volume of a cone =  ⅓ πr²h  

❷ Total Surface of a cone = πrl + πr²

❸ Slant height of a cone = √( r² + h² )

________

All Done ! :D

Answer 2

Given:-

Slant height of the cone is 10cm.

Radius of the cone is 7cm

To Find:-

Find the Curved Surface Area of the cone.

Concept:-

Firstly, let's go through the concept. Concept used here is Curved Surface Area (CSA) of a Cylinder.Substitute the given values in the equation and solve it.Lets do it.

Formulae Applied:-

Curved Surface Area of a Cone = πrl

Solution:-

Given that!

Slant height of the cone = 10cm

Radius of the cone = 7cm

CSA = ??

According to the question we have!

Curved Surface Area (CSA) of a cone = πrl

➝ πrl

➝ 22/7 × 10 × 7

➝ 22 × 10

➝ 220

➝ 220cm^2

Hence,

The Curved Surface Area of the cone is 220cm^2.

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