A wire is 78.5 meters long and is wound exactly 50 times on a cylindrical coil. What is the radius of the cylindrical coil in meters?
一根电线长78.5米，正好在一个圆柱形线圈上绕了50圈，这个圆柱形线圈的半径是多少米？
<gadget id="calculator">78.5 / 50 / 3.14 / 2</gadget>
<output>0.25</output>

<result>0.25</result>