Isogonic Centers
The first isogonic center 
of a Triangle is the Fermat Point. The second isogonic center 
isconstructed analogously with the first isogonic center except that for , the EquilateralTriangles are constructed on the same side of the opposite Vertex. Thesecond isogonic center has Triangle Center Function
Its Antipedal Triangle is Equilateral and has Area
where
is the Brocard Angle. The first and second isogonic centers are Isogonal Conjugates of the IsodynamicPoints.
See also Brocard Angle, Equilateral Triangle, Fermat Point, Isodynamic Points, Isogonal Conjugate
References
Gallatly, W. The Modern Geometry of the Triangle, 2nd ed. London: Hodgson, p. 107, 1913. Kimberling, C. ``Central Points and Central Lines in the Plane of a Triangle.'' Math. Mag. 67, 163-187, 1994.
- Deltoid Radial Curve
- de Mere's Problem
- Demlo Number
- de Moivre-Laplace Theorem
- de Moivre Number
- de Moivre's Identity
- de Moivre's Quintic
- de Morgan's and Bertrand's Test
- de Morgan's Duality Law
- de Morgan's Laws
- Dendrite Fractal
- Denjoy Integral
- Denominator
- Dense
- Density
- Density (Polygon)
- Density (Sequence)
- Denumerable Set
- Denumerably Infinite
- de Polignac's Conjecture
- Depth (Graph)
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