Category:三角形に関する定理

Law of cosines

Menelaus's theorem

Midpoint theorem (triangle)

Exterior angle theorem

Angle bisector theorem

Apollonius's theorem

Napoleon's theorem

Morley's trisector theorem

L'Huilier's theorem

Law of cotangents

Law of tangents

Bottema's theorem

Pappus's area theorem

Droz-Farny line theorem

Thomsen's theorem

Carnot's theorem (conics)

Carnot's theorem (perpendiculars)

Maxwell's theorem (geometry)

Jacobi's theorem (geometry)

Ceva's theorem

Stewart's theorem

Feuerbach hyperbola

Desargues's theorem

Routh's theorem

Law of sines

Heron's formula