wire is 12.56m long and is wound exactly 10 times on a cylindrical coil. What is the radius of the cylindrical coil in m?
一根电线长12.56m，正好在一个圆柱形线圈上绕了10圈，这个圆柱形线圈的半径是多少m？
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 10 / 6.28</gadget>
<output>0.2</output>

<result>0.2</result>