using System;

namespace csharp
{
    class Circle
    {
        static void Main(string[] args)
        {
            double radius1, radius2, area1, area2;
            Console.WriteLine("Enter Radius1: ");
            radius1 = Convert.ToDouble(Console.ReadLine());
            area1 = Math.PI * radius1 * radius1;
            Console.WriteLine("\nArea of circle: " + area1);
            Console.WriteLine("Enter Radius2: ");
            radius2 = Convert.ToDouble(Console.ReadLine());
            area2 = Math.PI * radius2 * radius2;
            Console.WriteLine("\nArea of circle: " + area2);
            Console.WriteLine("\nArea of shaded circle : " + (area2 - area1));
            Console.ReadKey();
        }
    }
}
