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lang-cpp
Shapeshouldn't know or care if what is derived needs 2, 3, 4, 5, or 100 points to calculate the area. Those items should be known by the derived class, notShape. On the other hand, your design would be perfect if on purpose, you only wanted derived shapes that took exactly 4 points to define the area. The compiler did its job, and that is to error out because yourTriangleviolated the restrictions of how to compute the area.