public Shape(Point2D Centroid) { this.Centroid = Centroid; }
public Circle(Point2D Centroid, double Radius) : base(Centroid) { this.Radius = Radius; }
//knows its a constructor so it knows where to put the information public Rectangle(Point2D Centroid, double Height, double Width) : base(Centroid) { this.Height = Height; this.Width = Width; }