A piece of iron wire is 12.56 meters long, and it just wraps 50 times around the circle of modern warfare. What is the radius of this circle?
一根铁丝长12.56米，正好在现代战争圆形圈上绕满50周，这个圆圈的半径是多少？
<gadget id="calculator">12.56 / 50 / 3.14 / 2</gadget>
<output>0.04</output>

<result>0.04</result>