The Steiner circle is the central circle with center at the nine-point center 
and radius
where 
is the circumradius of the reference
triangle.
It is the circumcircle of the Steiner deltoid.
It has circle function
which is not a Kimberling center.
The Steiner circle does not pass through any Kimberling centers.
See also
Central Circle,
Second
Steiner Circle,
Steiner Deltoid
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References
Lockwood, E. H. A Book of Curves. Cambridge, England: Cambridge University Press, 1967.Referenced
on Wolfram|Alpha
Steiner Circle
Cite this as:
Weisstein, Eric W. "Steiner Circle." From
MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SteinerCircle.html
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