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Triangle and
Squares 17. Level: High School, SAT Prep, College
geometry 
The figure shows squares ABDE, BCFG,
and ACHJ that are
constructed externally on the sides AB, BC, and AC of a triangle ABC.
ED and FG meet at M, GF and JH meet at N, DE and HJ meet at K.
Prove that KA, MB, and NC are concurrent in a point P. 


