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ring, mis tekib kera lõikamisel kera keskpunkti läbiva tasandiga
большой круг . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%B1%D0%BE%D0%BB%D1%8C%D1%88%D0%BE%D0%B9%20%D0%BA%D1%80%D1%83%D0%B3/1/rus (23.08.2026)