A piece of iron wire is 6.28cm long, and it is wound exactly 5 times on a circular iron ring. What is the radius of this coil in meters?
一根铁丝长6.28cm，正好在一个圆形铁圈上绕满5圈，这个线圈的半径是多少米？
<gadget id="calculator">6.28 / 5 / 3.14 / 2</gadget>
<output>0.2</output>

<result>0.2</result>