Wrap a rope around the trunk of a tree 10 times, and the measured result is 12.56 meters. What is the approximate diameter of the trunk cross section of this tree in centimeters?
用一根绳子绕一棵树的树干10圈，量得结果是12.56米，这棵树树干横截面的直径大约是多少厘米？
<gadget id="calculator">12.56 / 10 / 3.14</gadget>
<output>0.4</output>

<result>0.4</result>