Please see the attachment.
Assume the volume of the first cylinder is the same as the second after deformation. Can you find a relationship for the volume. The cylinder was uninformed radially.© BrainMass Inc. brainmass.com October 9, 2019, 9:35 pm ad1c9bdddf
A hollow cylinder is deformed in such that the length of inner surface is increased. The relation between the radii and lengths is derived.