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Tangent, sphere, pyramid

  1. Oct 18, 2007 #1
    There is a base-quadrilateraled pyramid ABCDS , which base is quadrilateral ABCD. Inscribed sphere is tangent in point P on the ABCD wall. Proof that


    I don't like geometry and i really don't know how to start.
  2. jcsd
  3. Oct 21, 2007 #2
    I guess you are participating both Physics and Mathematics Polish Olympiad... Try to ask this question on the website www.matematyka.org
  4. Oct 21, 2007 #3
    no i'm not
  5. Oct 22, 2007 #4
    That's interesting, because only about 2-3 of your threads are not connected to problems given to solve on the first levels of those olympiads...
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