Category:三角形に関する定理

Heron's formula

Midpoint theorem (triangle)

Napoleon's theorem

Angle bisector theorem

Desargues's theorem

Law of cotangents

Law of tangents

Feuerbach hyperbola

Bottema's theorem

Apollonius's theorem

Pappus's area theorem

Thomsen's theorem

Carnot's theorem (conics)

Carnot's theorem (perpendiculars)

Maxwell's theorem (geometry)

Jacobi's theorem (geometry)

Routh's theorem

Stewart's theorem

Droz-Farny line theorem

Morley's trisector theorem

Menelaus's theorem

Exterior angle theorem

Ceva's theorem

Law of sines

Law of cosines