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# Open polygon

## 18 posts in this topic

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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.

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.

Open Polygon - solution

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Posted · Report post

E

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Posted · Report post

|

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* * *

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* * *

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*__*__ *_

this way

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Posted · Report post

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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Posted · Report post

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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Posted · Report post

x - l

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Posted · Report post

i did it this way

4....5

-*---*..* 2

..... /|

.*...*...*

../....|

.*...*...*

1.......| 3

1-2-3-4-5

just dot(.)= space( )

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Posted · Report post

how about three vertical lines and one horizontal

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Posted (edited) · Report post

123

456

789

6-2-4-7-9

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

Edited by beck
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Posted · Report post

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

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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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Posted · Report post

wow that's not the way it looked in the email window....sorry

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Posted · Report post

wow that's not the way it looked in the email window....sorry

if you want to keep the spaces then use the code tags

```				  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[/code]```
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Posted · Report post

That was easy as!

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Posted · Report post

this is a fun puzzle but the version i did 2 or 3 years ago was that i couldnt lift the pencil from the paper and i had to connect all the dots with 4 lines

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Posted · Report post

there is a possibility to connect them by 3 lines if those dots have any size different from infinitely small and if it is possible to draw as long lines as we want.

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Posted · Report post

The origin of the expression "to think outside the box"

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Posted · Report post

0-0-0

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0-0-0

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0-0-0

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Posted · Report post

Open polygon - Back to the Logic Puzzles

Connect all 9 dots with 4 straight lines without lifting the pencil off the paper, and without going over the same line twice.

Open Polygon - solution

Wasnt one of your requirements not to go over the same line twice? Even though thats the solution ive seen and have, line 4 croses over line 3.

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