Question 1205156
<pre>

We are making the volume of a rectangular solid into a long thin cylinder.
The length of the wire (the "height", h, of the cylinder) is 100 yards, a 
yard is 36 inches so h = 3600 inches.

{{{L*W*H}}}{{{""=""}}}{{{pi*r^2*h}}}

{{{4*2*0.5}}}{{{""=""}}}{{{pi*r^2*3600}}}

{{{(4*2*0.5)/(pi*3600)}}}{{{""=""}}}{{{r^2}}}

{{{sqrt((4*2*0.5)/(pi*3600))}}}{{{""=""}}}{{{r}}}

{{{0.0188063195}}}{{{""=""}}}{{{r}}}

diameter = 2r = 2(0.188063195) = 0.0376126389 inches.

Round off as you were told.

Edwin</pre>