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ringi või tasandi neljandik, kus raadiused või sirged on risti
квадрант . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%BA%D0%B2%D0%B0%D0%B4%D1%80%D0%B0%D0%BD%D1%82/1/rus (10.08.2026)