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A
B C
A’
A"
B"
B’ C"
C’
ABC est un triangle rectangle.
On veut démontrer que
AB²+AC²=BC²
En d’autres termes, la somme
de la surface du carré ABB"A’, et
de celle du carré ACC’A" est
égale à la surface du carré
BCC"B’
Cliquer pour continuer
A
B C
A’
A"
B"
B’ C"
C’
On trace la hauteur du triangle
ABC qui part de l’angle droit
Cliquer pour continuer
Cette hauteur divise le carré
BCC"B’ en deux rectangles
Cliquer pour continuer
On va démontrer que la surface
du rectangle de gauche (en
bleu) est égale à celle du carré
de gauche (en bleu aussi).
On fera de même pour le
rectangle rose et le carré rose
Cliquer pour continuer
A
B C
A’
A"
B"
B’ C"
C’
On trace les lignes AB’ et CB"
Cliquer pour continuer
On démontre ensuite que la
surface du triangle AB’B est
égale à la moitié de la surface
du rectangle bleu.
Allez, un petit effort, c’est facile!
Cliquer pour continuer
On démontre ensuite que les
triangles AB’B et CBB" sont
égaux.
Facile!
Cliquer pour continuer
Enfin, on démontre que la
surface du triangle CBB" est
égale à la moitié de la surface
du carré bleu.
Le rectangle bleu et le carré
bleu ont donc la même surface
Cliquer pour continuer
A
B C
A’
A"
B"
B’ C"
C’
On procède de même pour la
partie droite en traçant les lignes
AC" et BC’
CQFD

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Pythagore, le pont aux ânes

  • 1. A B C A’ A" B" B’ C" C’ ABC est un triangle rectangle. On veut démontrer que AB²+AC²=BC² En d’autres termes, la somme de la surface du carré ABB"A’, et de celle du carré ACC’A" est égale à la surface du carré BCC"B’ Cliquer pour continuer
  • 2. A B C A’ A" B" B’ C" C’ On trace la hauteur du triangle ABC qui part de l’angle droit Cliquer pour continuer Cette hauteur divise le carré BCC"B’ en deux rectangles Cliquer pour continuer On va démontrer que la surface du rectangle de gauche (en bleu) est égale à celle du carré de gauche (en bleu aussi). On fera de même pour le rectangle rose et le carré rose Cliquer pour continuer
  • 3. A B C A’ A" B" B’ C" C’ On trace les lignes AB’ et CB" Cliquer pour continuer On démontre ensuite que la surface du triangle AB’B est égale à la moitié de la surface du rectangle bleu. Allez, un petit effort, c’est facile! Cliquer pour continuer On démontre ensuite que les triangles AB’B et CBB" sont égaux. Facile! Cliquer pour continuer Enfin, on démontre que la surface du triangle CBB" est égale à la moitié de la surface du carré bleu. Le rectangle bleu et le carré bleu ont donc la même surface Cliquer pour continuer
  • 4. A B C A’ A" B" B’ C" C’ On procède de même pour la partie droite en traçant les lignes AC" et BC’ CQFD