To rearrange the formula \( A = \pi r^2 \) for \( r \), you first need to isolate \( r \). Here’s how you can do it step by step:
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Start with the formula: \[ A = \pi r^2 \]
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Divide both sides by \( \pi \): \[ \frac{A}{\pi} = r^2 \]
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Take the square root of both sides to solve for \( r \): \[ r = \sqrt{\frac{A}{\pi}} \]
None of the provided responses seem to match the correct rearrangement of the formula directly. The correct answer, based on the rearrangement, should be: \[ r = \sqrt{\frac{A}{\pi}} \]
If "r" needs to be expressed in terms of "A" and involves "π," but isn't listed, it's worth double-checking the provided multiple-choice answers for correctness or potential typographical errors.