Question

*Find the curved surface area of a right circular cone whose slant height is 10 cm and base radius is 7 cm.*

1️⃣ 180 sq. cm
2️⃣ 420 sq. cm
3️⃣ 120 sq. cm
4️⃣ 220 sq. cm ​

Answer 1

Answer:

slant height (l) = 10 cm

radius (r)= 7 cm

Csa of cone= πrl

=22/7×7×10

=220 cm²

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Answer 2

Given :

• Slant Height of Cone is 10 cm.
• Radius of Cone is 7 cm.

To Find :

• Curved Surface Area of Cone .

Solution :

$\longmapsto\tt{Radius=7\:cm}$

$\longmapsto\tt{Slant\:Height(l)=10\:cm}$

Using Formula :

$\longmapsto\tt\boxed{C.S.A\:of\:Cone=\pi{rl}}$

Putting Values :

$\longmapsto\tt{\dfrac{22}{{\cancel{7}}}\times{{\cancel{7}}}\times{10}}$

$\longmapsto\tt{22\times{10}}$

$\longmapsto\tt\bf{220\:{cm}^{2}}$

So , Curved Surface Area of Cone is 220 cm²..

Option 4 ) 220 cm² is Correct ...

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• C.S.A of Cone = πrl
• T.S.A of Cone = πr(l+r)
• Volume of Cone = 1/3 πr²h

Here :

• r = Radius
• l = Slant Height
• h = Height

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