перпендикулярность . EKI Combined Dictionary 2026. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif/dlall/eki/%D0%BF%D0%B5%D1%80%D0%BF%D0%B5%D0%BD%D0%B4%D0%B8%D0%BA%D1%83%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D1%81%D1%82%D1%8C/1/rus (21.06.2026)
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перпендикулярность . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%BF%D0%B5%D1%80%D0%BF%D0%B5%D0%BD%D0%B4%D0%B8%D0%BA%D1%83%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D1%81%D1%82%D1%8C/1/rus (21.06.2026)
перпендикулярность . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%BF%D0%B5%D1%80%D0%BF%D0%B5%D0%BD%D0%B4%D0%B8%D0%BA%D1%83%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D1%81%D1%82%D1%8C/1/rus (21.06.2026)
перпендикулярность . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%BF%D0%B5%D1%80%D0%BF%D0%B5%D0%BD%D0%B4%D0%B8%D0%BA%D1%83%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D1%81%D1%82%D1%8C/1/rus (21.06.2026)
