A rope with a length of 12.56 meters can go around the trunk of a tree exactly 10 times. What is the approximate diameter of the trunk cross-section of this tree in centimeters?
长12.56米的绳子正好可以绕一棵树的树干10圈．这棵树的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>

<gadget id="calculator">0.4 * 100</gadget>
<output>40</output>

<result>40</result>