A pyramid is given (the base is convex quadrilateral). A sphere is inscribed in this pyramid and it is tangent to side at point . Prove that
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Can anybody tell me what are the conditions to inscribe sphere in a such pyramid
Last edited by Ununuquantium; Oct 9th 2007 at 10:17 AM.
I remember that base must be circonscrit on a circle. Can anyone confirm?
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