The pedal triangle is defined to be the triangle formed by connecting the feet of the altitudes drawn from some point to the extended sides of a triangle.
The orthic triangle is defined as the triangle formed by connecting the feet of the perpendiculars drawn from the orthocenter to the extended sides of a triangle.
If we assume that the pedal point is the orthocenter, then by definition, the pedal triangle is the orthic triangle.
This means that the vertices of the pedal triangle will be three of the points on the nine point circle.
To learn more about the Nine Point Circle Click here.
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