CirclePerimeterAndArea

using System;

//Write a program that reads the radius r of a circle and prints its 
//perimeter and area formatted with 2 digits after the decimal point. 
//Examples:
//r 	perimeter	area
//2	      12.57	   12.57
//3.5	  21.99	   38.48

class CirclePerimeterAndArea
{
    static void Main()
    {
        double r = double.Parse(Console.ReadLine());
        double pi = 3.142;
        double area =  pi * (2*r);
        double perimeter = 2 * pi * r;
        Console.WriteLine("Area: {0:f2}\nPerimeter: {1:f2}", area, perimeter);
        //OR?
       // Console.WriteLine("Area: {0:0.00}\nPerimeter: {1:0.00}",area, perimeter);
    }
}