At first, would you copy these 9 points on a sheet, and then try to find a method to pass along these 9 points, by using only 4 lines, and without raising the pen from the sheet, good luck !!  

          

           

 
 

Remark : If you hadn't found the solution, and your scientific curiosity push you to know the solution, would you contact me on rezguisami@mailcity.com to give you the password of the solution.

At the time you had the password, you can now reach to the Word file which contains the solution.

Remark : If you have the reading password, you will receive after a second request of the writing password. At this time don't enter anything but rather hit the "Reading only" button, and the document will be open automatically in reading (only !).

Go to the mathematical problem.

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