2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47405The relation between CP-violation phase angle and the other three mixing angles in Cabibbo-Kobayashi-Maskawa matrix is postulated. This relation has a very definite geometry meaning. The numerical result coincides surprisingly with that extracting from the experiments. It can be further put to the more precise tests in the future.7 pages, Latex file, the revised version for resubmittingHigh Energy Physics - Phenomenologytext