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Montrer qu'un triangle est rectangle : la méthode

Pauline Gabriac

Created on November 20, 2020

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Transcript

Montrer qu'un triangle est rectangle

4 cm

Dans le triangle ABC,

3 cm

5 cm

4 cm

le plus long côté est [AC].

3 cm

5 cm

AC ? BC + AB

AC = 5 = 25

BC + AB = 3 + 4 = 9 + 16 = 25

On remarque que

AC = BC + AB.

Donc d'après la réciproque du théorème de Pythagore, ABC est un triangle rectangle.