Similar to ヒポクラテスの定理

Thales's theorem

Arzelà–Ascoli theorem

Apollonius point

Van Lamoen circle

Euler's theorem in geometry

Carnot's theorem (inradius, circumradius)

Cramer–Castillon problem

Griffiths' theorem

Kosnita's theorem

Conway circle theorem

Simson line

Thébault's theorem

Feuerbach's theorem

Lexell's theorem

Five lemma

Apollonius's theorem

Euler's formula

Carathéodory's theorem (convex hull)

Kempner series

Cauchy's mean value theorem

Schiffler point

Sylvester–Gallai theorem

Stewart's theorem

Law of sines

Ceva's theorem

Newton's theorem (quadrilateral)

Annales de Gergonne