In some cases though Geometrivc constraints are not permitted or will not be suitable. In these cases, Numeric constraints or dimensions must be used. Next, extrude the sketch. We will look at the other options later. Many of the options allow you to tie the termination to the existing part, instead of just specifying a distance.
Revolutions are similar to extrusions in that they begin with a constrined sketch.
Unlike extrusions, revolutions require an axis. This may be a line on the profile or it may a Construction line, which must be included when you profile the sketch. A construction line is drawn in a linetype that is NOT continuous. The most noteable difference is that angles are now used instead of distances. Extrusions are done on a perpendicular straight-line path and revolutions are done on a circular path.