Calculates the rolled length of a roll of material when the outside diameter of the material, thickness
of the material, and the diameter of the hole in the center or the tube on which the material is wound
are given. Additionally, the surface area of material is also calculated by requiring that the width of
the roll be also given. Variations due to stretching or softness of the material are to be ignored.
An example of rolled material would be a rolled carpet or a rolled sheet of paper from the paper mill.
The length units that can be used are yard, feet, inch, meter, centimeter, millimeter and mil. A mil
is equal to one thousandth of an inch. The initial units used in the table can be changed to any of
the choices given.

