\[ 314 = 12.56 \times r^2 \]

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• \( A = 314 \, \text{cm}^2 \)
• Substitute and solve for \( r \):
• \[ 314 = 4 \times 3.14 \times r^2 \]
• \[ r^2 = \frac{314}{12.56} \]
• \[ r^2 \approx 25 \]
• \[ r = \sqrt{25} \]

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