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# Three touching circles on a line

online resource

posted on 2017-12-06, 00:00 authored by Noel PatsonThe 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.

## Funding

### Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

## History

## Publisher

Wolfram Mathematica## Open Access

- No

## Era Eligible

- Yes