using System;

​

interface IShape_C

{

    double circumference();

}

​

interface IShape_A

{

    double area();

}

​

class Circle : IShape_C, IShape_A

{

   public double radius;

   public Circle(double r)

   {

     radius = r;

    }

    public double circumference()

    {

      return Math.Round((2 * Math.PI * radius),2);

      }

     public double area()

     {

      return Math.Round((Math.PI * radius * radius), 2);

      }

    }

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter radius:");

        double r = Convert.ToDouble(Console.ReadLine());

        Circle circle = new Circle(r);

        Console.WriteLine("The radius of the circle is " + r);

        Console.WriteLine("The circumference of the circle is " + circle.circumference());

        Console.WriteLine("The area of the circle is " + circle.area());

    }

}