Category:三角形と円に関する定理

Lune of Hippocrates

Musselman's theorem

Fuhrmann circle

Cramer–Castillon problem

Van Lamoen circle

Miquel's theorem

Harcourt's theorem

Euler's theorem in geometry

Carnot's theorem (inradius, circumradius)

Polar circle (geometry)

Lexell's theorem

Kosnita's theorem

Pompeiu's theorem

Reuschle's theorem

Lester's theorem

Thébault's theorem

Thales's theorem

Simson line

Incenter–excenter lemma

Six circles theorem

Griffiths' theorem

Conway circle theorem

Van Schooten's theorem

Japanese theorem for cyclic polygons