An enameled wire is 15.7 meters long, and it is exactly 100 times wound on a circular coil. What is the diameter of this coil?
一条漆包线长15.7米，正好在一个圆形线圈上绕满100圈，这个线圈的直径是多少？
<gadget id="calculator">15.7 / 100</gadget>
<output>0.157</output>

<gadget id="calculator">0.157 / 3.14</gadget>
<output>0.05</output>

<result>0.05</result>