Question

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

Answer 1

Answer:

$\text{The tota; surface area is }\pi r(l+4r)$  

Step-by-step explanation:

Given the radius and slant height of cone which are

$Radius=2r$

$slant \thinspace height=\frac{l}{2}$

we have to find the total surface area of a cone

$T.S.A=\pi r(l+r)$

       $=\pi\times 2r(\frac{l}[2}+2r)$

       $=\pi\times 2r(\frac{l+4r}{2})$

      $=\pi r(l+4r)$