[studio] Radical Axis (also known as radicalaxis or Radical Axis, Inc.) is an animation studio headquartered in Atlanta, Georgia, United States known for its diverse work in both episodic television and commercials. Founded in 2000 by Scott Fry, an original animator on Aqua Teen Hunger Force for Adult Swim, Radical Axis has since become one...
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http://en.wikipedia.org/wiki/Radical_Axis_(studio)

where r1 and r2 are the radii of the two circles, d1 and d2 are distances from P to the centers of the two circles, and R is the radius of the unique orthogonal circle centered on P. The radical axis is always a straight line and always perpendicular to the line connecting the centers of the circles, albeit closer to the circumference of the large...
Found on
http://en.wikipedia.org/wiki/Radical_axis

The locus of points of equal power with respect to two circles. The radical center of three circles is the common point of intersection of the radical axes of each pair of circles.
Found on
http://www.daviddarling.info/encyclopedia/R/radical_axis.html
No exact match found.