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Quadrilateral Inequality (Posted on 2008-02-24) Difficulty: 3 of 5
 
For a quadrilateral ABCD, prove that

  |AB||CD| + |AD||BC| ≥ |AC||BD|.
See Ptolemy's theorem and the Ptolemy inequality.

See The Solution Submitted by Bractals    
Rating: 2.0000 (2 votes)

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