A copper wire is 18.84 meters long and is wound 40 times on a circular spool. What is the diameter of this circular spool in centimeters.
一根铜丝长18.84米，正好在一个圆形线轴上绕40周．这个圆形线轴的直径是多少厘米．
<gadget id="calculator">18.84 / 40 / 3.14</gadget>
<output>0.15</output>

<result>0.15</result>