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DescriptionTriangle somme des angles.png
Français : La somme des mesures des angles d'un triangle est l'angle plat. Ceci se montre facilement en traçant la parallèle à un des côté passant par le sommet opposé, et en considérant l'égalité des angles alterne-internes et des angles correspondants (c'est la preuve d'Euclide dans ses Éléments, I-32).
Auteur : Christophe Dang Ngoc Chan, réalisé avec un programme de dessin vectoriel.
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Original upload log
The original description page was here. All following user names refer to fr.wikipedia.
2004-02-03 13:12 Cdang 133×100× (2041 bytes) La somme des angles d'un triangle est l'angle plat.
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