MathDB
St.Peterburg, P3 Grade 11, 2013

Source:

April 17, 2014
geometry3D geometrytetrahedronparallelogramgeometry proposed

Problem Statement

Let MM and NN are midpoint of edges ABAB and CDCD of the tetrahedron ABCDABCD, AN=DMAN=DM and CM=BNCM=BN. Prove that AC=BDAC=BD.
S. Berlov
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