Mike, The good old Pythagorean Theorem can serve. In the attached figure, <a-sag.gif>, in orthogonal coordinates with axes N-S and E-W (could be Y, X ) R is the radius from point C to the East. For an increment n toward the North, there will need to be incremental movement to the East e if the circle is to be traced.
You can, of course, translate the location of C to start elsewhere on the circular arc. Bill Attachment converted: Macintosh HD:A-SAG.GIF (GIFf/JVWR) (000238FB)
