Une photo tu peux peut être utiliser le théorème de Pythagore mais thalès c'est pourtant super simple ! PTDR 

Bonsoir,

il y  a peut-être trop de lettres pour toi ?

Tu dois écrire : le périmètre du triangle REF à l'aide de ses longueurs (avec des lettres elles aussi), ainsi que celui du triangle RST.

Tu appliques le théorème de Thalès, et normalement tu obtiendras (encore avec des lettres) : RE = k RS ; RF = ...  ;  EF = ...

Il ne te restera qu'à conclure sur les périmètres !

Bonne résolution à toi !

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