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Affirmation 1:
Un menuisier prend les mesures suivantes dans le coin
d'un mur à 1 mètre au-dessus du sol pour construire
une étagère ABC:
AB= 65 cm; AC = 72 cm et BC = 97 cm
Il réfléchit quelques minutes et assure que l'étagère a
un angle droit.
B
1) L'affirmation suivante est-elle vraie ou fausse ?
2) Calculer l'aire de cette étagère.

Sagot :

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