Draw 4 straight lines in such a way that all the dots of a 3x3 array are touched.
geometry/nine.dots New
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Problem
Draw 4 straight lines in such a way that all the dots of a 3x3 array are touched. . . . . . . . . . [ Editor: problem statement reconstructed from the question as quoted in the reply. ]
Show solution
Actually, you only need 3, but if you want them to be drawn with only
one `pen down' and one `pen up' that is not too difficult either:
*---*---*--/
| \ /
* * *
| X
* * *
| / \
-- Phil Brady <P.R.Brady@swan.ac.uk>, July 1994