CircleAreaAndPerimeter - Chapter 2.0

//Task 006, Chapter 2.0
using System;

public class CircleAreaAndPerimeter
{
    static void Main()
    {
        double r = double.Parse(Console.ReadLine());

        Console.WriteLine("Area = " + Math.PI * r * r);
        Console.WriteLine("Perimeter = " + 2 * Math.PI * r);
    }
}