Update textbook.fr.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/12.en/textbook.fr.md

@@ -37,7 +37,7 @@ RESPOND:
 --------------------
 (CME-FR) _Good mastery, with exercises to develop automatisms:_
 
- - The *fractions* (related to the Pythagorean theorem in the right triangle, and the rule of three 3)
+ - The *fractions* (related to the Pythagorean theorem in the right-angled triangle, and the cross-multiplication's rule)
 
 RESPOND:
 (XXX-YY) ...
@@ -108,7 +108,7 @@ RESPOND:
 !
 
 (CME-FR) _Good mastery, with exercises to develop automatisms:_
-* *Pytahgore's theorem / rule of three* (in relation to fractions and the right triangle)
+* *Pytahgore's theorem / the cross-multiplication's rule* (in relation to fractions and the right-angled triangle)
 
 RESPOND:
 ... (XXX-YY)