Category:三角形と円に関する定理

Feuerbach's theorem

Thales's theorem

Musselman's theorem

Simson line

Miquel's theorem

Incenter–excenter lemma

Cramer–Castillon problem

Pompeiu's theorem

Van Lamoen circle

Six circles theorem

Harcourt's theorem

Thébault's theorem

Euler's theorem in geometry

Carnot's theorem (inradius, circumradius)

Polar circle (geometry)

Reuschle's theorem

Fuhrmann circle

Kosnita's theorem

Van Schooten's theorem

Lester's theorem

Lexell's theorem

Griffiths' theorem

Conway circle theorem

Japanese theorem for cyclic polygons

Lune of Hippocrates