Question

The radius and slant height of Cone is 2 cm and 6cm respectively its curved surface

area is ……….........cm².

a) 12 π b) 4 π c) 8 π d) 6 π​

Answer 1

Answer :

›»› The curved surface area of cone is 12π cm².

Step-by-step explanation :

Given :

• Radius of a cone = 2 cm.
• Slant height of a cone = 6 cm.

To Find :

• Curved surface area of cone = ?

Formula required :

Formula to calculate the curved surface area of cone is given by,

→ CSA of cone = πrl.

Here,

• CSA is the Curved surface area of cone.
• r is the Radius of cone.
• l is the Slant height of cone.

Solution :

As we are given with the radius of cone and slant height of cone we know the required formula, that is,

→ CSA of cone = πrl.

Using the formula to calculate the curved surface area of cone and substituting all the given values in the formula we get :

→ CSA of cone = π * 2 * 6

→ CSA of cone = π * 12

→ CSA of cone = 12π

Hence, the curved surface area of cone is 12π cm².

So, option (a) 12π is correct ✔.

Extra Brainly Knowledge :

Some related formulae :

• Volume of cone = ½πr²h.
• CSA of cone = πrl.
• TSA of cone = πrl + πr².
• Volume of cylinder = πr²h.
• TSA of cylinder = 2πrh + 2πr².
• Volume of cube = a³.
• CSA of cube = 4a².
• TSA of cube = 6a².

Where,

• CSA is the Curved surface area.
• TSA is the Total surface area.
• The value of π is 22/7 and 3.14.
• r is the Radius.
• h is the Height.
• l is the Slant height.
• a is the Side.

Answer 2

Answer:

$\huge \bf Given$

Radius of cone = 2 cm

Slanght height of cone = 6 cm

$\huge \bf To \: Find$

CSA of cone

$\huge \bf Solution$

As we know that

CSA of cone = πrl

Here,

R = Radius.

L = Slanght height.

Now,

Let's find CSA

CSA = π × 2 × 6

Note :- π can't be cancelled. Therefore

CSA = 12π cm

Hence :-

Correct Option (A)

Step-by-step explanation: