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(Puzzle) How can this be true?

  1. Jun 18, 2014 #1
    Am I getting dumb for some reason or is this a good puzzle?
    PF friends! What am I missing here?
    Really, from where did that empty block come?

    https://xgwwxq.by3301.livefilestore.com/y2mLyb0TiTKVjKIyM-YhPhH8eOUBpyahkjUp-JGHbYtGwUOUhaUCI8-nQbCiUgUR2JcwIsHxUVDu0Rc1Z9NuPIDyDiCORi9AMRbJ0afq0ZD3iFSO_bAKRzxuWL5O58DG0R5/Illusion008.jpg?psid=1
     
  2. jcsd
  3. Jun 18, 2014 #2

    CAF123

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    Gold Member

    Hi Adjoint,
    Look at (I.e use a ruler or calculate) the slopes of the green and red triangles. It is more of an illusion to begin with.
     
  4. Jun 18, 2014 #3
    Solution:
    The triangles are not really triangles. In the first pic. the 'hypotenuse' is bent inwards, while in the second it is bent outwards. Try Sam Loyd's dissection puzzle after this.
     
  5. Jun 18, 2014 #4
    Okey, I got this finally. Really, its more of an illusion than a puzzle.
     
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