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26 September, 09:28

A=4pi r^{2} solve for r

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  1. 26 September, 12:30
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    A = 4πr² Divide both sides by 4π

    A / 4π = r² Find the square root of both sides

    √ (A / 4π) = √ (r²) Cancel out the square with the square root

    √ (A / 4π) = r Switch the sides to make it easier to read

    r = √ (A / 4π)
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