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Problem 305: Square, Triangles, Angle, Side, Harmonic Mean
Level: High School, College, SAT Prep.

In the figure below, ABCD is a square and E is a point on CD. If lines AD and BE meet at F, prove that Conclusion to prove.  (BC2 is one-half the harmonic mean of BE2 and BF2)
 

Geometry problem: Square, Triangle 
 

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