Geometry: Orthocenter of a triangle, Theorems and Problems - Index 14

Feuerbach Theorem, Obtuse Triangle illustration
 

Feuerbach Theorem, Right Triangle illustration
 

Schiffler Point: Four Euler Lines with interactive animation and manipulation. Interactive Geometry Software.

Complete Quadrilateral: Ortholine-Steiner Line.
The orthocenters of the four triangles (BCE, CDF, ABF, ADE) of a complete quadrilateral ABCDEF lie on a line called Ortholine - Steiner Line.
Using Dynamic Software
Step-by-Step construction, Manipulation, and animation

Journey to the Center of a Triangle (1976). Incenter, Circumcenter, Centroid, Orthocenter.

Right Triangle: Centroid. Centers, Inradius, Circumradius, Incenter, Circumcenter, Orthocenter, Centroid, Poncelet's theorem, Sagitta

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