Question

The total surface area of a cone whose radius is 2r and slant height is 2l. Find total surface area.

Answer 1

Step-by-step explanation:

The total surface area of a cone is πR

2 +πLR, if R is the radius and L is the slant height.

Now, R=2r and L= 2l

So, the answer will be π(2r)

2 +πrl =πr(l+4r)

Hence, the answer is πr(l+4r).

Hope this answer helps you!!!

Answer 2

We know, the total surface area of a cone =πR2​+πLR

where R is the radius and L is the slant height.

Given, R=2r and L=2l​.

Therefore, the total surface area of the cone =π(2r)²+π(2l)(2r)

=π4r²+ 4πrl

= 4πr(r+l).

Hence, the answer is [4πr(r +l)]

Ans:- total surface area will be  [4πr(r +l)]

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