Are you asking how to display a dimension that shows the perimeter of a cylinder?
If that's your actual question...
The perimeter is not a defining dimension of the cylinder, thus can't be displayed directly. You can define a parameter which will contain the calculated perimeter.
(1) Tools -> Parameters
Define a new parameter, maybe "perimCylinder"
(2) Tools -> Relations
Write a relation that defines the perimeter, something like:
perimCylinder = pi * diaCylinder
(3) If you want to display the calculated perimeter on a drawing, you'd need to call it out preceded by a "&", like
The perimeter is &perimCylinder
You'll probably have to limit the number of decimal places displayed, which is done by adding a suffix of "[.n]" to the callout, such as "&perimCylinder[.3]" if you want three (3) decimal places.
