using System; //เขียนโปรแกรมโดยนางสาวปริญญาพร ดูหฤคำ

​

public class Circle 

{

    public double P;

    public double R;

    public Circle()

    {

        P =3.14; 

        R =5;

    }

}   

public class Program

{

    public static void Main()

    {

        Circle t1 = new Circle();

        Console.WriteLine("Circle radius = {0}",t1.R);

        Console.WriteLine("Circle area = {0}",t1.P*t1.R*t1.R);

    }

}