Question

Find the total surface area of a cone with radius r/2 and ht is 2l​

Answer 1

Answer:

Total surface area of cone=πr(r+l)

Given, radius =

2

r

and slant height =2l

Therefore new total surface area of cone =π

2r ( 2r +2l)

=π(

4

r

2

+rl)

=πr(l+

4

r

)