Possible Solutions
One may solve the problem by changing one's model, or perhaps using a different language, which could be a (not yet implemented) extension of an existing language, or by using a different paradigm. Exactly which option is appropriate will depend on who wrote Circle and who wrote Ellipse. If the same author is designing them both from scratch, then the author will be able to define the interface to handle this situation. If the Ellipse object was already written, and cannot be changed, then the options are more limited.
Read more about this topic: Circle-ellipse Problem
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