Grundlæggende geometri og målinger
I denne video skal vi se, hvordan trekanter kategoriseres ud fra deres sidelængder og vinkler. Vi skal stifte bekendskab med ikke-ligesidede, ligebenede og ligesidede trekanter samt spidsvinklede, retvinklede og stumbvinklede trekanter. Det bliver understreget, at trekanter kan kategoriseres på flere måder ved at bruge disse egenskaber. Lavet af Sal Khan.
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