Update cheatsheet.fr.md

00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/03.geometries-space-time/cheatsheet.fr.md

@@ -235,11 +235,38 @@ immersed in our three-dimensional (3D) space.
 ![](m3p2-euclidian-sphere_L1200.gif)
 
 
+\- Aprender por comparación qué es un espacio euclidiano (y lo que no sería) :<br>
+con dos variedades bidimensionales : un plano euclidiano y la superficie de una esfera.
 
+*[ToDoAgain]* :<br>
+![](euclidian-geometry-sum-angles-pi_L1200.jpg)
 
+*[ToDoAgain]* :<br>
+![](non-euclidian-geometry-sphere-sum-angle-pole-equatorial_L1200-2.jpg)
 
-*[ReadyForUse]* :<br>
+*[ToDoAgain]* :<br>
+![](euclidian-geometry-parallel-straight_lines.jpg)
 
+*[ToDoAgain]* :<br>
+![](non-euclidian-geometry-sphere-parallel-straight_lines.jpg)
+
+*[ToDoAgain]* :<br>
+![](euclidian-geometry-pi-cercle-radius_L1200.jpg)
+
+*[ToDoAgain]* :<br>
+![](non-euclidian-non-sphere-pi-cercle-radius_L1200.jpg)
+
+*[ToDoAgain]* :<br>
+![](euclidian-geometry-pi-cercle-radius_L1200_2.jpg)
+
+*[ToDoAgain]* :<br>
+![](non-euclidian-geometry-sphere-pi-cercle-radius_L1200-2.jpg)
+
+*[ToDoAgain]* :<br>
+![](euclidian-geometry-pi-cercle-radius_L1200-3.jpg)
+
+*[ToDoAgain]* :<br>
+![](non-euclidian-geometry-sphere-pi-cercle-radius_L1200-3.jpg)