
A cylinder is the shape of a soup can. If we cut off the top
and bottom of the can and vertically cut the remaining part we have the
following pieces:



These two circles are from the top and bottom of the
cylinder.

This rectangle is the 'tube' part flattened out.
The figure at the right shows an oblique cylinder. The
bases are parallel but the segments connecting corresponding points are not
perpendicular to the bases. In other words, they do not form a right angle with
either base, making the cylinder appear slanted.
