/**
   A RightTriangle with a base point, width and height.
   @author Greg Vogl
   last modified 2003-10-14
*/
public class RightTriangleShape extends RectangleShape
{
   // constructors
   public RightTriangleShape() { super(); }
   public RightTriangleShape(double width, double height) { super(width, height); }
   public RightTriangleShape(double x, double y, double width, double height) 
      { super(x, y, width, height); }

   // calculations
   public double area() { return super.area() / 2; }
   public double perimeter() 
   { 
     double w = width(); double h = height();
     return w + h + Math.sqrt(w * w + h * h); 
   }

   // toString is same as superclass, not needed
}