Given a triangle ABC (see the figure above)
with the squares ABDE, BCFG, ACHJ, and HJKL. If M is the center of
square HJKL, prove that lines DH, GJ, and BM are concurrent at O.
Dynamic Geometry Environment (DGE) or Interactive Geometry Software
(IGS) of Problem 902
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Solution/Comment | by Antonio Gutierrez