**Technical terms in geometry - part 2 **

This awareness of various ways of classifying numbers contributes to a greater confidence with number. The same is true of shapes. Just as with numbers, we might recognize an attribute common to certain shapes (such as having three sides), form them into a category, give the set a name (for example, the set of triangles) and then, if necessary, make the classification more explicit with a precise definition. This process of classifying and naming leads to a greater confidence in handling shapes and a better awareness of the shapes that make up the world around us.

**Remember**

**The role of a definition in teaching and learning is not to enable pupils to formulate a concept, but to sharpen it up once the concept has been formed informally through experience and discussion, and to deal with doubtful cases.**