http://demonstrations.wolfram.com/TheCirclesOfDescartes/
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In a circle, the curvature (or bend) is the reciprocal of the radius, c = 1 / r . (When measured from the inside, the curvature is negative.) Four mutually tangent circles have the property 2(c12 + c22 + c32 + c42) = (c1 + c2 + c3 + c4)^2. This is the D...
Contributed by: Ed Pegg Jr
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