Modify base class so the changes get reflected in derived class?

Using an intermediary class that inherits the base class can solve the problem. Rectangle and the others inherits it so that if it is required to add new methods, it is implemented inside the intermediary class.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.