package 
{
   public class AvoidUseOfWithKeyword 
    {
        function polar(r:Number):void { 
           var a:Number, x:Number, y:Number; 
           with (Math) { 
              a = PI * pow(r, 2); 
              x = r * cos(PI); 
              y = r * sin(PI / 2); 
           } 
           trace("area = " + a); 
           trace("x = " + x); 
           trace("y = " + y); 
        }        
        
    }

}