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Rearrange formula

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### If    $A = \\pi d^2+4$   rearrange to make “$d$” the subject.

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$d= \\sqrt{\\frac{A-4}{\\pi}}$

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$d= {\\frac{A2-4}{\\pi}}$

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$d= \\frac{A-4}{\\pi}$

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$d= \\sqrt{\\frac{\\pi}{A-4}}$

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