Category:三角形に関する定理

Menelaus's theorem

Stewart's theorem

Exterior angle theorem

Bottema's theorem

Apollonius's theorem

Pappus's area theorem

Routh's theorem

Thomsen's theorem

Carnot's theorem (conics)

Carnot's theorem (perpendiculars)

Maxwell's theorem (geometry)

Jacobi's theorem (geometry)

Law of tangents

Desargues's theorem

Droz-Farny line theorem

Feuerbach hyperbola

Midpoint theorem (triangle)

Law of cotangents

Ceva's theorem

Morley's trisector theorem

Angle bisector theorem

Napoleon's theorem

Law of sines

Law of cosines

Heron's formula