#3PointInACircle

static void Main()
        {
            int centerX = 0;
            int centerY = 0;
            int radius = 2;
            Console.WriteLine("Coordinates of point x: ");
            double x = double.Parse(Console.ReadLine());
            Console.WriteLine("Coordinates of point y: ");
            double y = double.Parse(Console.ReadLine());
            if (Math.Pow((x - centerX), 2) + Math.Pow((y - centerY), 2) <= Math.Pow(radius, 2))
            {
                Console.WriteLine(true);
            }
            else
            {
                Console.WriteLine(false);
            }
        }