# Three Touching Circles on a Line

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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.

Contributed by: Noel Patson (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Idea taken from Sangaku.

## Permanent Citation

"Three Touching Circles on a Line"

http://demonstrations.wolfram.com/ThreeTouchingCirclesOnALine/

Wolfram Demonstrations Project

Published: March 7 2011