public class Parallelogram3 extends Rectangle
{
  // We extend the rectangle class
  // Hence we "inherit" a copy of Rectangle variables
  double angle;
  
  Parallelogram3(double width, double height, double an){
    super(width, height);
    angle = an;
  }
  
  // We redefine or "override" area()
  double area(){
    return super.area()*Math.sin(angle);
  }
  
  // We don't need to define setposition!
  
  // we don't need to define printDetails!
  // Note that the above definition of printDetail()
  // picks up the new definition of area()!
  
  double getAngle(){
    return angle;
  }
  
  public static void main(String args[]){
    Rectangle rect1;
    Parallelogram plg1;
    Parallelogram2 plg2;
    Parallelogram3 plg3;
    
    rect1 = new Rectangle(20, 10);
    plg1 = new Parallelogram(20, 10, 1);
    plg2 = new Parallelogram2(20, 10, 1);
    plg3 = new Parallelogram3(20, 10, 1);
    
    rect1.printDetails();
    plg1.printDetails();
    plg2.printDetails();
    plg3.printDetails();
  }
}