9 dots are arranged in the form of a square

 

Without altering the arrangement , You have to draw 4 straight lines may be equal or unequal in length so as to touch all the points atleast once.

 

Your 2nd line would start where the first line ends and so on

 

The diagram is like this

 

 

 

 

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Though i tried many times i was not able to find the answer. Hope you all help me

There.

thanks very much

Can it be done by making a wider line so as to cover the whole length of points in a single line!!!

That would kinda defie the definition of a line Good thinking though.

I recieved a semanir at DAL (Dalhousie University in Halfiax) long time ago, and it provdied the 9-joining-dots problem. It's a good problem to show critical thinking, and the structure of the question. What I meant is, by the definition of "line". If it only said "line", then the line can be wavy, curvy, straight, whatever you think. Although, the question said "straight lines".

 

The point is that you always have to read the questions carefully.