Question

6. Find the total surface area of a cone of radius 2r and slant height L/2

Answer 1

Answer:

as, Curved surface ar. 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)