For any triangle, the sum of any two sides is strictly greater than the third: a + b > c. Generalises to any metric space.
Triangle inequality
Related concepts
- Euclidean axioms
- Law of cosines
- Law of sines (circumradius form)
- Heron's formula
- Menelaus' theorem
- Ceva's theorem
- Compton scattering: Delta lambda = (h / m_e c)(1 - cos theta); 4-momentum conservation
- Maldacena-Shenker-Stanford 2016 universal chaos bound λ_L ≤ 2πk_BT/ℏ
- Young equation γ_lv cos θ = γ_sv − γ_sl (three-phase contact)