[" 2.Racher,cint asked to make a model shaped like a cylinder with "],[" two cones attached at its two ends by using a thin aluminium sheet.The diameter of the "],[" model is "3cm" and its length is "12cm" .If each cone has a height of "2cm" ,find the volume "],[" of air contained in the model that Rachel made.(Assume the outer and inner dimensions "],[" of the model to be nearly the same.) "]