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Le périmètre du carré
Matériel didactique : Tableau noir,craies et illustrations
Objectif opérationnel : Au terme de cette séquence didactique les apprenants seront capable de distinguer,reconnaître,tracer,de définir et calculer le périmètre d'un carré.

Rappel

Qu'avons-nous étudié la fois passée en géométrie?Qu'est-ce que le carré?

Rappel

Nous avons étudié la fois passée en géométrie le carré. Le carré est une figure géométrique qui a 4 cotés égaux et 4 angles droits.

Motivation

Le maitre illustre au tableau et trace le carré; comment appelle-t-on la partie extérieure du carré ?

Motivation

La partie extérieure du carré s'appelle le périmètre.

Annonce du sujet

Quelle est la leçon du jour ?

Annonce du sujet

La leçon d'aujourd'hui en géométrie nous allons étudier le périmètre du carré.

Le maitre demande aux élèves d'ouvrir le carré et de chercher la marche a suivre pour trouver la formule du périmètre carré.

Qu'est-ce que le périmètre ?

Le périmètre est la somme de cotés.

Quels sont les mots synonymes du périmètre?

Le synonyme de périmètre est le contour ou le pourtour.

Comment doit-on calculer le périmètre du carré ?

Pour calculer le périmètre du carré on fait P=C +C+C + C .

Pourquoi prendre cotés 4 fois?

On prend cotés fois 4 parce que le carré a 4 cotés égaux.

Qu'est-ce que nous venons d'étudier en géométrie ?

Exemple 

Quel est le périmètre du carré dont le coté a 3 m?

Aujourd'hui en géométrie nous venons d'étudier le périmètre du carré.

Exemple 

Quel est le périmètre du carré dont le coté a 3 m?

P= 3 cm +3 m + 3 m+ 3 m = 12 m

8.1.28PHP Version173msRequest Duration6MBMemory UsageGET lessons/{id}/{slug}Route
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    • Application (135ms)
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