using System;

namespace exercise_2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("enter the value for the radius of the biggest circle: ");
            double radius1 = Convert.ToDouble(Console.ReadLine());
            double area1Circle = CalculatingArea(radius1);
            Console.WriteLine("The area of the first circle is " + area1Circle);

            Console.WriteLine("enter the value for the radius of the smallest circle: ");
            double radius2 = Convert.ToDouble(Console.ReadLine());
            double area2Circle = CalculatingArea(radius2);
            Console.WriteLine("The area of the first circle is " + area2Circle);

            double shadedArea = FindDifference(area1Circle, area2Circle);
            Console.WriteLine("The value for the shaded area is " + shadedArea);
        }


        static double CalculatingArea(double radius)
        {
            const double PI = 3.14;
            double area = PI * (radius * radius);
            return area; 

        }

        static double FindDifference( double area1 , double area2) 
        {
            double difference = area1 - area2;
            return difference;
        }

        
    }




}
