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   }
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    this.height=iHeight;
   }
     Triangle.prototype=new Polygon();
     Triangle.prototype.getArea=function(){
     return 0.5*this.base*this.height;
     };
     function Rectangle(iWidth,iHeight){
     Polygon.call(this,4);
     this.width=iWidth;
     this.height=iHeight;
     }
     Rectangle.prototype=new Polygon();
     Rectangle.prototype.getArea=function(){
     return this.width*this.height;
     };
     var triangle=new Triangle(12,4);
     var rectangle=new Rectangle(22,10);
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