Category:三角形に関する定理

Law of sines

Menelaus's theorem

Law of cosines

Ceva's theorem

Law of tangents

L'Huilier's theorem

Desargues's theorem

Apollonius's theorem

Law of cotangents

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)

Feuerbach hyperbola

Exterior angle theorem

Napoleon's theorem

Stewart's theorem

Midpoint theorem (triangle)

Angle bisector theorem

Heron's formula

Routh's theorem

Morley's trisector theorem