Question

Find the total surface area of the cone whose radius.is r/2 and slant
height is 2L.
​

Answer 1

Step-by-step explanation:

Total surface area of cone=πr(r+l)

Given, radius =

2

r

and slant height =2l

Therefore new total surface area of cone =π

2

r

(

2

r

+2l)

=π(

4

r

2

+rl)

=πr(l+

4

r

)