Similar to ケイシーの定理

Maxwell's theorem (geometry)

Mittenpunkt

Face (geometry)

Mohr–Mascheroni theorem

Jacobi's theorem (geometry)

Euclidean geometry

Langley's Adventitious Angles

Cathetus

Regiomontanus' angle maximization problem

Hexagon

frame

Inscribed angle

Inscribed angle theorem

Circle packing theorem

Eyeball theorem

Clifford's circle theorems

Five circles theorem

Butterfly theorem

Schinzel's theorem

Descartes' theorem

Pappus chain

Six circles theorem