Similar to トリリウムの定理

Cramer–Castillon problem

Griffiths' theorem

Kosnita's theorem

Conway circle theorem

Simson line

Thales's theorem

Thébault's theorem

Reuschle's theorem

Japanese theorem for cyclic polygons

Harcourt's theorem

Lune of Hippocrates

Van Schooten's theorem

Fuhrmann circle

Pompeiu's theorem

Musselman's theorem

Miquel's theorem

Lester's theorem

Six circles theorem