A copper wire is 12.56 meters long and is wound around the cylinder exactly 40 times. What is the diameter of this cylinder in centimeters.
一根铜丝长12.56米，正好在圆筒上绕了40周．这个圆筒的直径是多少厘米．
<gadget id="calculator">12.56 / 40 / 3.14</gadget>
<output>0.1</output>

<gadget id="calculator">0.1 * 100</gadget>
<output>10</output>

<result>10</result>