A wire is 19 meters long, and there is 0.16 meters left after winding 50 times around a circular iron post. What is the radius of the cross section of this iron post in meters?
一根铁丝长19米，在一个圆形铁柱上绕满50圈还余下0.16米，这根铁柱横截面的半径是多少米？
<gadget id="calculator">19 - 0.16</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 / 50 / 2 / 3.14</gadget>
<output>0.06</output>

<result>0.06</result>