Question

If the radius and length of cone are r/2 and 2l. What is its total surface area

Answer 1

radius = r/2
slant height = 2l
Therefore TSA = 22/7 × r/2 ( r/2 + 2l)
11/7 × r × (r+4l)/2
( 11r^2 × 44rl)14

Answer 2

surface area of a cone =$\pi r(r+l)$
r = r/2 and l =2l
so,
         =$\pi \frac{r}{2}( \frac{r}{2}+2l)$
         =$\pi \frac{r^2}{2} +rl$