Descartes' theorem (disambiguation) explained

In geometry, Descartes' theorem states that, for every four mutually tangent circles, the radii of the circles satisfy a certain quadratic equation.

Descartes' theorem may also refer to:

• Descartes' theorem on total angular defect, on angles in polyhedra
• Descartes' rule of signs, on roots of polynomials

See also

• List of things named after René Descartes