Area of a Circle in C#

 A simple program to ask the user to give a radius and then the program will convert the given radius into the area of the circle equivalent using C# programming language.

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Program Listing

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Area_of_a_Circle

{

    class Program

    {

        static void Main(string[] args)

        {

            double radius, AREA;

            const double PI = 3.14;

            Console.WriteLine("============================================");

            Console.WriteLine("\tArea of a Circle in C#");

            Console.WriteLine("=============================================");

            Console.WriteLine();

            Console.Write("\tEnter the radius of circle : ");

            radius = Convert.ToDouble(Console.ReadLine());

            AREA = PI * radius * radius;

            Console.WriteLine();

            Console.WriteLine("\tThe area of circle is {0} when radius is {1}.", AREA, radius);

            Console.WriteLine("\n");

            Console.WriteLine("\tEnd of Program");

            Console.ReadKey();

        }

    }

}