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Důkaz věty o středovém a obvodovém úhlu - úvod.
Zpět na MA-FY-NET: [url]http://www.gvp.cz/~vinkle/mafynet/GeoGebra/matematika/planimetrie/03_vlastnosti_kruznice/stredove_obvodove_usekove/03_dukaz_vety_o_OS/dukaz_vety_S_O.html[/url]