Isogonal Conjugate of the Nine-Point Center

Let triangle A'B'C' be the triangle formed by reflecting the vertices of triangle ABC in the opposite sides. The midpoint N' of the segment joining the circumcenter O and O' of the two triangles is the isogonal conjugate of the nine-point center N.
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Steve Phelps —

 
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geometry  triangle 
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English
 
 
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