Wolfram Demonstrations Project
8773

Three Touching Circles on a Line

The radius of the middle circle (purple) of three circles all touching each other and a line is given by a formula in terms of the radii of the two outside circles. Drag the points to vary the outside circles.

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Idea taken from Sangaku.

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"Three Touching Circles on a Line" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/ThreeTouchingCirclesOnALine/
Contributed by: Noel Patson
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