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Math Help - Hard, pyramid and sphere inscribed

  1. #1
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    Hard, pyramid and sphere inscribed

    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}
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  2. #2
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    Can anybody tell me what are the conditions to inscribe sphere in a such pyramid
    Last edited by Ununuquantium; October 9th 2007 at 09:17 AM.
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  3. #3
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    I remember that base must be circonscrit on a circle. Can anyone confirm?
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