Answer
$d = \sqrt\frac{sl}{kw}$
Work Step by Step
$s = \frac{kwd^2}{l}$, solve for $d$.
$sl=kwd^2$
Divide the equation by $kw$ to isolate $d^2$.
$\frac{sl}{kw} = d^2$
$d = \sqrt\frac{sl}{kw}$
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