[Jumpstart C#] Console HMWRK - Area And Perimeter

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace AreaAndPerimeter
{
    class Program
    {
        static void Main(string[] args)
        {


            Console.Write("Radius = ");
            double radius = Double.Parse(Console.ReadLine());

            double pi = 3.14159d;

            double perimteter = 2 * pi * radius;
            double area = pi * radius * radius;

            Console.WriteLine("Perimeter: {0:F4}", perimteter);
            Console.WriteLine("Area: {0:F4}", area);
        }
    }
}