Update cheatsheet.fr.md

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

@@ -165,6 +165,22 @@ and for self-assessment exercises :
 ![](euclidian-space-plane-thales-theorem-3.png)
 
 
+**Propiedades de un espacio euclidiano / Propriétés d'un espace euclidien / 
+Properties of a Euclidean space**
+
+*[ReadyForUse]* :<br>
+![](euclidian-space-plane-trigonometry-right-angled-triangle-cosine-sine-exo5.png)
+
+*[ReadyForUse]* :<br>
+![](euclidian-space-plane-trigonometry-right-angled-triangle-cosine-sine-exo5.png)
+
+
+*[ReadyForUse]* :<br>
+![](euclidian-space-plane-trigonometry-right-angled-triangle-cosine-sine-exo5.png)
+
+
+*[ReadyForUse]* :<br>
+![](euclidian-space-plane-trigonometry-right-angled-triangle-cosine-sine-exo5.png)