Category:三角形に関する定理

Morley's trisector theorem

Heron's formula

Ceva's theorem

Napoleon's theorem

Menelaus's theorem

Desargues's theorem

Law of sines

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)

Apollonius's theorem

Exterior angle theorem

Routh's theorem

Feuerbach hyperbola

Law of cotangents

Angle bisector theorem

Stewart's theorem

Midpoint theorem (triangle)

Law of tangents

Law of cosines