задача 8

            Console.Write("Entering point coordinate - X : ");
            double coordinateX = double.Parse(Console.ReadLine());
            Console.WriteLine();

            Console.Write("Entering point coordinate - Y : ");
            double coordinateY = double.Parse(Console.ReadLine());
            Console.WriteLine();

                if ((coordinateX * coordinateX + coordinateY * coordinateY) <= 25)
                {
                    Console.WriteLine("Point is inside a circle with R = 5");
                }
                else
                {
                    Console.WriteLine("Point is outside of the circle with R = 5");
                }