Category:三角形と円に関する定理

Lune of Hippocrates

Musselman's theorem

Thales's theorem

Fuhrmann circle

Cramer–Castillon problem

Van Lamoen circle

Harcourt's theorem

Euler's theorem in geometry

Carnot's theorem (inradius, circumradius)

Polar circle (geometry)

Kosnita's theorem

Incenter–excenter lemma

Pompeiu's theorem

Reuschle's theorem

Miquel's theorem

Lester's theorem

Thébault's theorem

Six circles theorem

Griffiths' theorem

Conway circle theorem

Simson line

Van Schooten's theorem

Japanese theorem for cyclic polygons