Descartes's theorem (disambiguation)

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

Descartes's theorem may also refer to:

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

See also List of things named after René Descartes