Activité sur les longueurs d'un terrain de foot pour les 3eP

3ePasserelles/Geometrie/Manipulation_longueurs/fig/terrain_foot.svg

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3ePasserelles/Geometrie/Manipulation_longueurs/index.rst

@@ -0,0 +1,35 @@
+Figure géométriques, longueurs et codage avec les 3e passerelles pour l'année 2017-2018
+#######################################################################################
+
+:date: 2017-08-29
+:modified: 2017-08-29
+:tags: Geometrie
+:category: 3e
+:authors: Bertrand Benjamin
+:summary: On y revoit comment calculer des longueurs et coder une figure avec les 3e passerelles pour l'année 2017-2018
+
+
+Étape (univers?)
+================
+
+On travail sur les `longueurs d'un terrain de foot <./terrain_foot_a4.pdf>`_.
+
+Sur plusieurs demi séances et avec progressivité on pose des questions de longueurs.
+
+- Longueur/largeur d'un stade de foot?
+- Longueur de la ligne médiane?
+- Longueur du tour du terrain?
+- Longueur du tour de la surface de réparation (En se posant la question si l'on compte la partie de ligne de but)?
+- Distance entre le point central et la ligne de touche?
+- Distance entre le point central et le but?
+- Longueur d'une cage de but?
+- Longueur du tour de la surface de but (dure!)?
+- Distance entre le point central et la surface de réparation?
+- Distance parcourus si je fais 3 tours de terrain en courant?
+- Distance parcourus si je fait un tour du rond central?
+
+Les réponses intéressantes seront marquées sur la cahier de bord. Il faudrait faire ressortir la notion de codage d'une figure et la nécessité de nommer les angles pour communiquer plus simplement.
+
+Le but étant d'arriver à la tache complexe finale:
+
+    Pour aider le jardinier à peindre le marquage du terrain de foot, on veut tendre un fil au dessus de chaque trait. Quelle longueur de fil doit-on prévoir?