Three Tangent Circles. Inscribed and Circumscribed Circles, Radii.

Click the figure below to see the complete illustration.

See also:

Complete Soddy Circles and Descartes Theorem

Collection of Geometry Problems

Circle, Theorems and Problems

Level: High School, SAT Prep, College geometry

## Saturday, May 30, 2009

### Soddy Circles and Descartes Theorem

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Dear Pierre,

ReplyDeleteThank you for your comment. Now, the outer Soddy radius formula includes the negative sign (As shown in the diagram).