This AutoCAD version doesn't provide the actual function that you requested.
However, you may search through the net and will be able to get some add-on programs to do what you want.
BTW, you may also post your question in AutoLisp forum below so people may give you more helps.
http://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/bd-p/130
Please mark "Accept as Solution" and "Like" if my reply resolves the issue and it will help when others need helps.
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A circle is the locus of a cursor, starting and ending at the same point on a plane in model space or in layout such that its distance from a given coordinates (X,Y) is always constant.
X² + Y² = C²
