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();
        }
    }
}

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