The orthoptic circle of the Steiner inellipse is the circle with center at
 |
(1)
|
corresponding to the triangle centroid 
and radius
 |
(2)
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It has circle function
 |
(3)
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corresponding to the circumcenter 
.
It does not pass through any Kimberling centers.
It is orthogonal to the Parry circle (green) and Stevanović circle (blue).
