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I need to re-arrange the following equation (see link JPG below please, sorry I'm not familiar with how to write an equation on here and as I'm a newbie it won't let me post images) to solve for $d$:

$L = 4\pi C_x d^2.$

Thank you.

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    @De$n$$n$is Henry: Divide. Take square roots. Get rid of the absolute value.2010-12-02

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As Arturo said

$L=4 \pi C_x d^2$

$\implies d^2 = \frac{L}{4 \pi C_x}$

$\implies d= \pm\sqrt{\frac{L}{4 \pi C_x}}$

Your equation looks like it is physical, so the negative square root may not be relevant