Category:三角形に関する定理

Heron's formula

Law of sines

Law of cosines

Ceva's theorem

Law of tangents

Law of cotangents

Exterior angle theorem

Feuerbach hyperbola

Stewart's theorem

Apollonius's theorem

Routh's theorem

Pappus's area theorem

Bottema's theorem

Morley's trisector theorem

Thomsen's theorem

Carnot's theorem (conics)

Carnot's theorem (perpendiculars)

Maxwell's theorem (geometry)

Menelaus's theorem

Jacobi's theorem (geometry)

Napoleon's theorem

Droz-Farny line theorem

Angle bisector theorem

Midpoint theorem (triangle)

Desargues's theorem