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Math Help - Lengths in cubes.

  1. #1
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    Exclamation Lengths in cubes.

    Let ABCDA'B'C'D will cube, such as in the figure. points K, L, M, N lie on the middle of edge of the AD, BC, A'B ', C'D'. Points P and Q lie on the segments KM and LN. The edge of the cube is 2 Prove that PQ> √ 2

    The tasks are edited by google translator, so sorry for linguistic confusion
    please prompt and detailed-response
    Thank you very much for all answers
    The person who will do all of the five tasks that I threw today must be a real genius
    Attached Thumbnails Attached Thumbnails Lengths in cubes.-matma.jpg  
    Last edited by mr fantastic; October 23rd 2011 at 12:26 PM. Reason: Re-titled.
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  2. #2
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    Re: very difficult task, needed for now,please

    Quote Originally Posted by isel View Post
    Let ABCDA'B'C'D will cube, such as in the figure. points K, L, M, N lie on the middle of edge of the AD, BC, A'B ', C'D'. Points P and Q lie on the segments KM and LN. The edge of the cube is 2 Prove that PQ> √ 2

    The tasks are edited by google translator, so sorry for linguistic confusion
    please prompt and detailed-response
    Thank you very much for all answers
    The person who will do all of the five tasks that I threw today must be a real genius
    What's the rush? Where has the question come from? NB: MHF provides help, not detailed solutions.
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