七 15

2010年puzzleup竞赛第1题

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原题：http://www.puzzleup.com/2010/puzzle/?219

You are using a drawing program on a computer. You place several equilateral triangles of the same size on the screen. You observe that you can cover any of these triangles by moving the other triangles without rotating.

What is the minimum number of triangles you have to place on the screen to ensure that this observation holds true for every case?

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One Response to “2010年puzzleup竞赛第1题”

  1. yaoyue Says:
    七月 27th, 2010 at 5:26 下午

    only two equilateral triangles with a side parallel

    [回复]

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