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Somme des angles d'un triangle

Deux figures :

  • Un triangle, la mesure de ses 3 angles et leur somme.
  • Un triangle, qu'un animation permet de "plier" de façon à superposer les trois sommets. (Pour donner l'idée d'une démonstration de la propriété.)
This Resource is Copied from a First-Steps Trace

Coming from trace Somme des angles d un triangle (geolabo)? which mentioned 2 constructions.

  • Geometry system: Geolabo.
  • Country: fr
  • Educational level: 5e
  • Main topic: Triangles
  • Other themesangles, symétrie axiale

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