a cylinder ,a cone and a hemisphere are of the same base and of the same height.what will be the ratio of their volumes ?

In case of the hemisphere, radius= r
Volume of the hemisphere = 2/3 ³
In case of cylinder, radius= r, height= r
Volume= 1/3 r²h= r3
In case of cone, radiius= r, height= r
Volume of the cone= 1/3r²h = 1/3r³
Ratio of their volumes = r³ : 1/3r³ : 2/3r³
  =  1:1/3:2/3
  = 3 : 1 : 2