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Open polygon


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17 replies to this topic

#1 rookie1ja

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Posted 30 March 2007 - 03:35 PM

Open polygon - Back to the Cool Math Games
Connect all 9 dots with 4 straight lines without lifting the pencil off the paper, and without going over the same line twice.

9bodov.gif

This old topic is locked since it was answered many times. You can check solution in the Spoiler below.
Pls visit New Puzzles section to see always fresh brain teasers.


Spoiler for Solution

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#2 imtcb

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Posted 22 June 2007 - 07:22 AM

E
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#3 mannu

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Posted 26 June 2007 - 10:53 AM

|
| /
* * *
| /
* * *
| /
*__*__ *_


this way
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#4 mannu

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Posted 26 June 2007 - 10:56 AM

I apologise if thats not clear ...thts bcoz i dont know how to draw it in this editor...

But to describe it in words, draw a line joining the pts at the left side of the array of points and then another one joining the last row......now extend the two lines a little. Now draw another line from here thru the 2nd and sixth point... The last one id drawn as a diagonal to the square formed by the array of dots...
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#5 Fysh

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Posted 11 November 2007 - 06:55 PM

You didn't meet the requirements of the solution with an open polygon. There is a closed polygon and a line, but that doesn't make an open one.
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#6 simplyhumble

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Posted 12 November 2007 - 09:25 AM

x - l
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#7 coldone

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Posted 18 November 2007 - 01:04 AM

i did it this way
4....5
-*---*..* 2
..... /|
.*...*...*
../....|
.*...*...*
1.......| 3
1-2-3-4-5
just dot(.)= space( )
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#8 bigskybuuck

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Posted 27 January 2008 - 07:04 PM

how about three vertical lines and one horizontal
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#9 beck

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Posted 30 January 2008 - 12:16 AM

123
456
789

6-2-4-7-9

edit: bah, jumped ahead of myself. didn't use all 9

Edited by beck, 30 January 2008 - 12:17 AM.

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#10 stevo1904

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Posted 03 February 2008 - 11:41 PM

1000020000300000
00 0
0 0 0
0 0 0
0 0 0
4 5 6
0 0 0
0 0
0 0 0
0 0 0
7 8 9
0 0
0 0
0 0
0 0
0

sorry about the diagram,did the best I could! anyway start at 1 draw a line thru 2 and 3 going past 3 far enough
to draw a 45 degree line thru 6 and eight extending past 8 to line up 7,4 and 1.draw a line thru 7,4,and 1.
now 45 deg. thru 1,5 and 9.
Had to do this for 5th grade math extra credit way back when,only you couldn't lift pencil from paper. :)
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