square wire with side $S$ if $S^2 = \pi D^2/4$, i.e.,
\[ D = \sqrt{\frac{4 S^2}{\pi}} = \frac{2 S}{\sqrt\pi} \,\text{.} \]
Volume is conserved, so if the original and final wire lengths
square wire with side $S$ if $S^2 = \pi D^2/4$, i.e.,
\[ D = \sqrt{\frac{4 S^2}{\pi}} = \frac{2 S}{\sqrt\pi} \,\text{.} \]
Volume is conserved, so if the original and final wire lengths