Very interesting, a pyramid and sphere inscribed

Thread starter JuanR
Start date Oct 4, 2007
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Inscribed Interesting Pyramid Sphere

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JuanR

Thread starter
Oct 4, 2007

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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JuanR

Oct 4, 2007

* 180^{o} means 180 degree

Very interesting, a pyramid and sphere inscribed

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