Oldknow Points
The Perspective Centers of a triangle and the Tangential Triangles of its inner and outer Soddy Circles, given by
where
is the Incenter and Ge is the Gergonne Point.See also Gergonne Point, Incenter, Perspective Center, Soddy Circles, Tangential Triangle
References
Oldknow, A. ``The Euler-Gergonne-Soddy Triangle of a Triangle.'' Amer. Math. Monthly 103, 319-329, 1996.
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