L'aire \( A = \pi r^2 \).
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- La formule de la circonférence est \( C = 2\pi r \).
- Résolvons pour \( r \): \( 2\pi r = 31.4 \).
- \( r = \frac{31.4}{2\pi} \approx 5 \) mètres (en utilisant \( \pi \approx 3.14 \)).
- \( A \approx 3.14 \times 5^2 = 3.14 \times 25 = 78.5 \) mètres carrés.
- #### 78.5 mètres carrés
- Un compte bancaire croît de 5 % par an. Si le montant initial est de 1000 $, quel sera le solde après 3 ans ?
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