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How to proof RHOMB

  1. Jan 8, 2010 #1

    Can anyone help me?
    How to proof/disproof there is a rhomb?


    thnx very very much...
  2. jcsd
  3. Jan 8, 2010 #2
    Is it a regular pentagon? And are any lines given parallel?
  4. Jan 8, 2010 #3
    Yes, it is regular.

    I don't know about the parallel lines (they seems to be parallel...)

    I'm looking forward ...

    Last edited: Jan 8, 2010
  5. Jan 10, 2010 #4
    I really need it!
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