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Dreiecke
- Beweis Winkelsumme beim Dreieck über Stufenwinkel
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Beweis Winkelsumme beim Dreieck über Stufenwinkel
Beweis für die Winkelsumme von Dreiecken über Wechselwinkel
Beweis Winkelsumme beim Dreieck über Stufenwinkel


Verändere mit dem Schieberegler die x-Koorinate von C
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