Similar to フォントネーの定理

Incenter–excenter lemma

Japanese theorem for cyclic polygons

Harcourt's theorem

Lune of Hippocrates

Van Schooten's theorem

Pompeiu's theorem

Musselman's theorem

Miquel's theorem

Lester's theorem

Six circles theorem

Triangle

Acute triangle

Circular triangle

Golden triangle (mathematics)

Ono's inequality

Circumcircle

Tangential triangle

Wind triangle

Circumcevian triangle

Nine-point circle

Nine-point conic

Modern triangle geometry

Kepler triangle

Congruent isoscelizers point

Equal parallelians point