L’aire d’un triangle (9e-GM.1)
Dans cette vidéo, nous allons découvrir comment trouver la formule pour calculer l’aire d’un triangle.
Savoir comment la découvrir va nous faciliter à la mémoriser ! Une fois que le procédé est clair, et que nous pouvons le visualiser, il sera facile de se rappeler la formule.
Thèmes
Nombres :
• Les nombres naturels
• Fractions
• Puissances et racines
Géométrie :
• Périmètre et aire de polygones
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