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Prove that angle AKB=angle DMC

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September 14, 2010
geometry3D geometryspheretetrahedrongeometry unsolved

Problem Statement

The sphere inscribed in tetrahedron ABCDABCD touches the sides ABDABD and DBCDBC at points KK and MM, respectively. Prove that ∠AKB=∠DMC\angle AKB = \angle DMC.
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