The third Brocard triangle is Gibert's term for the isogonal conjugate of the first Brocard triangle.
It has trilinear vertex matrix
The third Brocard triangle is Gibert's term for the isogonal conjugate of the first Brocard triangle.
It has trilinear vertex matrix
Weisstein, Eric W. "Third Brocard Triangle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ThirdBrocardTriangle.html