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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();   }   }