Prove that orthocenters of the four
components triangles (BCE, CDF, ABF, ADE) of a complete quadrilateral ABCDEF lie on a line called Ortholine, Steiner
line, Orthocentric line. See also:
Artwork
of Problem
1169,
Adobe Spark. Reference: David Wells. Curious and
Interesting Geometry, Penguin Books, 1991.
![Geometry Problem 1169 Complete Quadrilateral, Orthocenters of the Component Triangles, Collinear Points, Ortholine, Steiner-line, Orthocentric line Problem 1169 Complete Quadrilateral, Orthocenters of the Component Triangles, Collinear Points, Ortholine, Steiner-line, Orthocentric line](p1169-ortholine-complete-quadrilateral-steiner-line-tutoring.gif)
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