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min vol of a tetrahedron

Source: Polish MO Recond Round 1989 p3

September 9, 2024
geometry3D geometrytetrahedronVolumegeometric inequality

Problem Statement

Given is a trihedral angle OABC OABC with a vertex O O and a point P P in its interior. Let V V be the volume of a parallelepiped with two vertices at points O O and P P , whose three edges are contained in the rays OA \overrightarrow{OA} , OB \overrightarrow{OB} , OC \overrightarrow{OC} . Calculate the minimum volume of a tetrahedron whose three faces are contained in the faces of the trihedral angle OABCOABC and the fourth face contains the point PP.