Mathematics tricks - The Challenge

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This is the challenge...
look at the video thumbnail.you can see 9 dots right side of video thumbnail.

cut the these 9 dots using 4 straight lines only.
you can't go backward.
you can't put off the pen or pencil while drawing.

dear friends....can you do it ? try and watch the video for right answer.

thank you.
Chanaka Uththamawadu

Mathematics tricks - The Challenge | Ecency