using System;

public class Program

{

    public static void Main()

    {

        double a = double.Parse(Console.ReadLine());

        double b = double.Parse(Console.ReadLine());

        double side = double.Parse(Console.ReadLine());

        double r = double.Parse(Console.ReadLine());

        Console.WriteLine("{0}", Geometry.ObikolkaKvadrat(side));

        Console.WriteLine("{0}", Geometry.LiceKvadrat(side));

        Console.WriteLine("{0}", Geometry.RectanglePerimeter(a, b));

        Console.WriteLine("{0}", Geometry.RectangleArea(a, b));

        Console.WriteLine("{0}", Geometry.CircleArea(r));

    }

}

​

public class Box{

    private double width;

    private double length;

    private double height;

    public double Width{

        get{return width;}

        set{width = value;}

    }

    public double Length{

        get{return length;}

        set{length = value;}

    }

    public double Height{

        get{return height;}

        set{height = value;}

    }

    public Box(double width, double length, double height){

        height = Height;

        length = Length;

        width = Width;

    }

    public double Surface(double width, double length, double height){

        return width * length * height;

    }

    public double LSurface(double width, double length, double height){

        return 2*(length * height) + 2 * (length * width);

    }

    public double ASurface(double width, double length, double height){

        return 2*(length*width) + 2*(length * height) + 2*(width * height);

    }

}

​

static class Geometry{

    static double a;

    static double b;

    static double side;

    static double r;

    public static double ObikolkaKvadrat(double side){

        return side*4;

    }

    public static double LiceKvadrat(double side){

        return side*side;

    }

    public static double RectanglePerimeter(double a, double b){

        return 2 * a + 2 * b;

    }

    public static double RectangleArea(double a, double b){

        return a*b;

    }

    public static double CircleArea(double r){

        return 2 * Math.PI * r;

    }

}