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Sagot :

Réponse:

1)Calculer AC en m :

Tan 36° = BC/AC

AC = BC / tan 36°

AC = 3,5 / tan 36°

36°AC ≈4,82 m

2)aire en m^2 de ABC :

3.5×4.82/2

=8.435m²

≈8.44m²

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