2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45094Koide has pointed out that the mass relation $m_e + m_μ + m_τ = {2 \over 3}(\sqrt{m_e} + \sqrt{m_μ} + \sqrt{m_τ})^2 $ is consistent with the most recent measurements of the tau lepton mass. We point out that this relation has a geometric interpretation.4, McGill/94-9High Energy Physics - Phenomenologytext