Similar to シムソンの定理

Mittenpunkt

Menelaus's theorem

Face (geometry)

Mohr–Mascheroni theorem

Jacobi's theorem (geometry)

Euclidean geometry

Langley's Adventitious Angles

Cathetus

Regiomontanus' angle maximization problem

Hexagon

frame

Polar circle (geometry)

Thébault's theorem

Incenter–excenter lemma

Japanese theorem for cyclic polygons

Harcourt's theorem

Lune of Hippocrates

Van Schooten's theorem

Musselman's theorem

Miquel's theorem

Lester's theorem

Six circles theorem