In geometry, Descartes' theorem, named after René Descartes, establishes a relationship between four kissing, or mutually tangent, circles. The theorem can be used to construct a fourth circle tangent to three given, mutually tangent circles.
Read more about Descartes' Theorem: History, Definition of Curvature, Descartes' Theorem, Special Cases, Complex Descartes Theorem, Generalizations
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“To insure the adoration of a theorem for any length of time, faith is not enough, a police force is needed as well.”
—Albert Camus (1913–1960)