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(geomeetrias:) ring, mille raadius on 1 (ehk võrdne ühe pikkusühikuga)
единичный круг . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%B5%D0%B4%D0%B8%D0%BD%D0%B8%D1%87%D0%BD%D1%8B%D0%B9%20%D0%BA%D1%80%D1%83%D0%B3/1/rus (08.10.2026)