C4X8_Square.java

//Square.java   MrG 2011.1020
public class Square
{
    private double side;

    public Square(double side)
    {
        this.side = side;
    }

    public double getArea()
    {
        return side*side;
    }

    public double getPerimeter()
    {
        return 4*side;
    }

    public double getDiagonalLength()
    {
        return Math.sqrt(2)*side;
    }
}