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(geomeetrias:) (korrapärane) hulktahukas, millel on neli tahku
тетраэдр . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%82%D0%B5%D1%82%D1%80%D0%B0%D1%8D%D0%B4%D1%80/1/rus (20.08.2026)