The Yff central circle, a term coined here for the first time, is the circumcircle of the Yff central triangle.
Yff Central Circle
See also
Yff Central TriangleExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Yff Central Circle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/YffCentralCircle.html