Saturday, May 30, 2009

Soddy Circles and Descartes Theorem

Three Tangent Circles. Inscribed and Circumscribed Circles, Radii.
Click the figure below to see the complete illustration.

 Soddy Circles and Descartes Theorem.
See also:
Complete Soddy Circles and Descartes Theorem
Collection of Geometry Problems
Circle, Theorems and Problems

Level: High School, SAT Prep, College geometry

1 comment:

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