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Very interesting, a pyramid and sphere inscribed

  1. Oct 4, 2007 #1
    A pyramid ABCDS is given (the base is convex quadrilateral). A sphere is inscribed in this pyramid and it is tangent to side ABCD at point P.
    Prove that
    \angle APB + \angle CPD = 180^{o}
     
  2. jcsd
  3. Oct 4, 2007 #2
    * 180^{o} means 180 degree
     
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