After making 5 circles of the same size with a 3.5-meter-long iron wire, there is 0.36 meters left. What is the diameter of each circle in meters?
用一根长3.5米长的铁丝做了5个一样大的圆圈之后，还剩下0.36米，每个圆圈的直径是多少米．
<gadget id="calculator">0.785 / 3.14</gadget>
<output>0.25</output>

<result>0.25</result>