public class TriangleDriver
{


    /**
     * Constructor for objects of class TriangleDriver
     */
    public TriangleDriver()
    {
            EquilateralTriangle equilateralTr = new EquilateralTriangle(12);
            RightTriangle rightTr = new RightTriangle(12);
            System.out.println("perfect " + equilateralTr.getRatio());
            System.out.println("right " + rightTr.getRatio());
    }

}


public abstract class Triangle
{

private double side;

public Triangle(double a)
{
    side = a;
}

/**
 * Return area of triangle.
 */
public abstract double getArea();

/**
 * Return Perimeter of triangle.
 */
public abstract double getPerimeter();


}


public class RightTriangle extends Triangle
{
    // instance variables - replace the example below with your own
    
    private double side;
    
    /**
     * Constructor for objects of class RightTriangle
     */
    public RightTriangle(double a)
    {
        super(a);
    }

    public double getPerimeter()
    {
        return (2 + Math.sqrt(2.0)) * side;
    }
    
    public double getArea()
    {
        return side * side / 2;
    }
    
   /**
    * Return the area : perimiter ratio
    */
   public double getRatio()
   {
    return getArea()/getPerimeter();
   }
}



public class EquilateralTriangle extends Triangle
{
    // instance variables - replace the example below with your own
    
    private double side;
    
    /**
     * Constructor for objects of class EquilateralTriangle
     */
    public EquilateralTriangle(double a)
    {
        super(a); 
    }
    
    public double getArea()
    {
        return Math.sqrt(3) / 4 * side * side;
    }
    
    public double getPerimeter()
    {
        return 3 * side;
    }
    
   /**
    * Return the area : perimiter ratio
    */
   public double getRatio()
   {
    return getArea()/getPerimeter();
   }
   
}