static void Main(string[] args)
        {
            List<Circle> circleList = new List<Circle>();
            circleList.Add(new Circle(1,2,3));
            circleList.Add(new Circle(344, 2, 5));
            circleList.Add(new Circle(4, 2, 2));


            Circle CircleWithMaxArea= circleList.OrderByDescending(x => x.Area()).FirstOrDefault();
}


 class Circle
    {

        public double X { get; set; }
        public double Y { get; set; }

        public double Radius { get; set; }

        public Circle(double x, double y, double radius)
        {
            this.X = x;
            this.Y = y;
            this.Radius = radius;
        }

        public double Area()
        {
            return Math.PI * this.Radius * this.Radius;
        }

        public Circle Clone()
        {
            return new Circle(this.X, this.Y, this.Radius);
        }

    }