&lt;p&gt;Chapitre 4.&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; Angles et triangles&lt;br&gt;
2. Triangle &lt;br&gt;
2.2 p&eacute;rim&egrave;tre et aire d'un triangle &lt;br&gt;
Exemple&lt;br&gt;
D&eacute;finition&lt;br&gt;
2.3 triangle rectangle&lt;br&gt;
Exemple&lt;br&gt;
D&eacute;finition&lt;br&gt;
Propri&eacute;t&eacute;&lt;br&gt;
2.4 triangle isoc&egrave;le&lt;br&gt;
Exemples&lt;br&gt;
D&eacute;finition&lt;br&gt;
Propri&eacute;t&eacute;&lt;br&gt;
2.5 triangle rectangle isoc&egrave;le&lt;br&gt;
Exemples &lt;br&gt;
D&eacute;finition&lt;br&gt;
Remarques&lt;br&gt;&lt;/p&gt;