Comment #1 on issue 2963 by [email protected]: geoemtry objects should derive from Basic
http://code.google.com/p/sympy/issues/detail?id=2963
Also, there's a bunch of really bad OOP in the module. For example, Circle redefines vradius, hradius, major, and minor, when these can be determined from the superclass (Elipse).
And by the way, subclassing from tuple is **not** necessary; this is just a hackish way of doing the same things as .args.
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