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import work from year 2016-2017

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Benjamin Bertrand
2017-06-16 09:49:23 +03:00
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Notes sur la (re)découverte de symétries pour les 5e
####################################################
:date: 2016-10-27
:modified: 2017-03-31
:tags: Geometrie, Symetrie
:category: 5e
:authors: Bertrand Benjamin
:summary: Chapitre d'appropriation des symétries pour les 5e.
Objectifs
=========
- Reconnaitre des 2 types de symétries
- Tracer le symétrique de figures
Étape 1
=======
Retrouver les transformations sur des `cocottes <./classer_symetries_A4.pdf>`_.
Sur la cahier de groupe, on range les cocottes qui ont subit les mêmes transformations et on écrit une phrase pour la décrire.
Étape 2
=======
On s'intéresse à la famille *symétrie axiale*.
En reliant les sommets correspondant, on retrouve l'axe de symétrie et on la notion de médiatrice.
On colle les 2 vignettes correspondant à cette famille et on note le vocabulaire.
Étape 3
=======
On s'intéresse à la (nouvelle) famille *symétrie centrale*.
On demande comment décrire cette transformation.
En reliant les sommets, on retrouve le centre de symétrie.
On colle les 3 vignettes correspondant à cette famille et on note le vocabulaire.
On parle rapidement de la vignette restante.
Étape 4
=======
`Premières symétries <./tracer_symetries1.pdf>`_ à tracer pour construire une technique de construction.
Étape 5
=======
Cette étape a été faite beaucoup plus tard dans l'année avec une classe plutôt faible. Il s'agit de reconstituer un vitrail cassé, le travail sur la symétrie facilite beaucoup la reproduction.
`Vitraux cassés <./TC_vitrail.pdf>`_

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