Orthic Triangle

(some authors refer to this triangle as the pedal triangle)


The triangle joining the feet of the altitudes of a triangle is called the orthic triangle.

As a point of interest the orthocenter (H) of the original triangle is the incenter (I) of the orthic triangle. It is also interesting to note that the triangle with smallest perimeter that can be inscribed in an acute-angled triangle ABC is the orthic triangle of traingle ABC. For an interesting discussion of this statement click here.

For a proof of the statement that the orthocenter of the original triangle is the incenter of the orthic triange click here.

For a GSP sketch showing the behaviour of the orthic triangle click here.



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