Question

Given a sphere, cylinder, cone of same radius find ratio of theri curved surface area

Answer 1

csa of sphere=0
csa of cylinder=$2 \pi rh$
csa of cone=$\pi r^{2}$

ratio between sphere,cone and cylinder=0:1:2h

Answer 2

curved surface area of sphere =4r²
curved surface area of cylinder =2r(2r) =4r²
curved surface area of cone =rl
  
ratio of their curved surface area  =4r²:2rh:rl
                           =4r²:4r²:r²
                           = 4:4: