Definitions from Wikipedia (Descartes' theorem)

▸ noun:  In geometry, Descartes' theorem states that for every four kissing, or mutually tangent, circles, the radii of the circles satisfy a certain quadratic equation.
▸ noun:  In geometry, Descartes' theorem states that, for every four mutually tangent circles, the radii of the circles satisfy a certain quadratic equation.


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