Question

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

Answer 1

Given,

Radius=r/2 and slant height =2l

TSA of cone=πr(l+r)
= 22/7×r/2(2l+r/2)
= 11r/7(4l+r)/2
=44lr+11lr/14
=55lr/14

Hope it helps

Answer 2

I think this is correct.