Answers

2015-03-09T17:27:58+05:30
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
1 5 1
is csa of sphere
it doesn't have curve
2015-03-09T18:34:58+05:30
Curved surface area of sphere =4
curved surface area of cylinder =2r(2r) =4
curved surface area of cone =rl
  
ratio of their curved surface area  =4r²:2rh:rl
                           =4r²:4r²:r²
                           = 4:4:
0