Question

find the total surface area of a cone of radius 2r and slant height l/2

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Answer 1

Answer:

πr( l+4r )

Step-by-step explanation:

Curved surface area of cone = πrl

Total surface area of a cone= πrl + πr²  

Here, Radius = 2r

Slant height = L/2

So, CSA = π (2r) (L/2) = πrl

TSA = πrl + π(2r)² = πr( l+4r )