Apollonian circles are two families of circles such that every circle in the first family intersects every circle in the second family orthogonally, and vice versa. These circles form the basis for bipolar coordinates. They were discovered by Apollonius of Perga, a renowned Greek geometer.
Read more about Apollonian Circles: Definition, Bipolar Coordinates, Pencils of Circles, Radical Axis and Central Line, Inversive Geometry, Orthogonal Intersection, and Coordinate Systems
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