Hi there,

This is actually a pretty long question to answer, there’s actually a very good tutorial discussing just that:

http://cadsetterout.com/autocad-tutorials/converting-ellipses-to-arcs/

but anyhow, follow the following procedure:

Steps:

– Use proper Osnap.

– changing Pellipse system variable to 1. ( this inforce autocad to draw ellipse as a Polyline.

– Now you can get center points from the poly ellipse shape.

For detailed instructions please visit:
http://cadsetterout.com/autocad-tutorials/converting-ellipses-to-arcs/

Hope this helps. 😉