perplexus.info :: Shapes : Nine dots

Nine dots (Posted on 2003-02-14)

Consider 9 dots arranged in a three by three square. Connect all these 9 points with four lines without lifting your pen from the paper.

See The Solution Submitted by Gautam

Rating: 3.3529 (17 votes)

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9 dots problem - solution

| Comment 2 of 20 |

line 1 (1,1) to (4,1)
line 2 (4,1) to (1,4)
line 3 (1,4) to (1,1)
line 4 (1,1) to (3,3)
QED

Posted by Nigel Nisbet on 2003-02-14 07:49:54

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