Xinding Sun from University of California, Santa Barbara found yet another twist to the problem.įurther variants are discussed at the CTK Exchange - the old archive. This puzzle is a great illustration of the importance of 'thinking outside the box' This is because this puzzle is seemingly impossible to connect all the dots with only 4 straight lines. Thought and points out even more of self-imposed restrictions that I missed considering the 9-point problem Now, try to think of a restriction you imposed on yourself which was not inherent to the problem.Īs an aside, Lars Hellvig from Stockholm, Sweden picks up this line of In this puzzle, you must connect all the dots using only 4 straight lines without lifting the pencil (ie: new lines must be connected to the previous one). The solution lies in the observation that it's permissible to cross square boundaries. Can you do it Click here to see the solution to the Connect 9 Dots with 4 Lines Puzzle. As a matter of fact there are more than one alternative way to connect 9 dots with 8 straight lines (I know for sure up to four alternative. For one always comes up with 5 lines instead of 4. In this puzzle, the challenge is to connect all 9 dots using only 4 Lines. The problem is to connect the dots with no more than 4 straight lines without lifting your hand from the paper. One classical example is where nine dots are arranged on the sides and the center of a square as in the picture below. I guess it depends on what you mean by 'unite them all'. Axes object 1 contains an object of type line. Three horizontal segments and one vertical segment, each passing through three of the points, seem to do the job. For example, if your trim size is 6 x 9 (15.24 x 22.86 cm), set the page size to. The best hint, in my view, is to mention that often, when solving a problem, we implicitly impose constraints that have not come with the problem. Connect the 9 dots using four straight lines without lifting Puffun, puzzles. subplot( ax ) makes the axes specified by ax the current axes for the parent figure.
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