Assignment Question: Create a Circle class with a centre (x, y) and radius r. Use parameterized constructor to initialize the radius and centre of a circle object. Wirite a copy constructor that copies the values of one circle object to another one. Use a member function to display the values x, y, r of a circle object. Allow a friend function to update the centre and radius of the circle. There should a static variable 'number_of_circles' and a static member function 'update_rumber_of_circles' which will update the 'number_of_circles' whenever an instance of a circle is created.

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