I'll do my best to illustrate it here
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Start at the top left star, and draw a line to the bottom right star. Then go to the star all the way above that one. Draw a diagonal to the bottom left star, and draw a line left until you get to the center bottom dot. Tada!
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Here are the 12 dots, labeled so we can talk about them:[1] - [ 2 ] - [ 3 ] - [ 4 ] -[5] - [ 6 ] - [ 7 ] - [ 8 ] -[9] - [10] - [11] - [12] --- Put your pencil down on #9, and don't pick it up until you're finished.-- Draw line-1 up through #5 and #1, and keep going up for a ways,just far enough so you can do the next step with a straight line.-- Draw line-2 slanting down through #2, #7, and #12.-- Draw line-3 straight to the left, through #11, #10, and back to #9.-- Draw line-4 slanting up, through #6 and #3, and keep going fora ways, until you're exactly straight up above #4.-- Draw line-5 straight down, through #4 and #8 .It all depends on the arrangement of the dots.Besides, there is nothing about straight lines, so used curved lines insteaddistribute the 12 dots around the perimeter of a pentagonSince you didn't specify the lines have to be the same length... Arrange the dots in a grid as follows :-OOOOOOOOOOOOThen - starting at he top left corner, draw a 'square spiral' (doesn't matter whether you go clockwise or anti--clockwise) - this will cover ALL the dots AND use only five lines !See Related Link below for a graphic.It all depends on the arrangement of the dots.Besides, there is nothing about straight lines, so used curved lines instead
To connect 9 dots with 4 lines, you must think outside the box. The key is to draw lines that extend beyond the boundaries of the dots. Start by drawing a line that goes through the first three dots in an L shape, then continue the line outside the dots to connect the remaining dots. This unconventional approach allows you to connect all 9 dots with just 4 lines.
Put the dots in a general square outline. But make one side have 4 dots and the others have 3. Then go around the outline of the square.
refer http://wiki.answers.com/Q/How_do_you_make_10_dots_on_5_lines_with_only_4_dots
You start by drawing a line upwards then you draw a line to the right, then draw a line straight down, then draw a line to the left. These 4 lines form a perfect square. To connect the fifth dot you draw a diagonal line from the bottom left corner of the square (where you left off) to the top right hand corner. You then draw a line in a Northwest direction about half the length of the rest of the lines to arrive at the fifth dot. You then draw a line from this dot to the dot at the top left corner of the square.