A rope is 13.56 meters long, and it can wrap 10 times around the trunk of a tree with 1 meter remaining. What is the approximate diameter of the trunk cross section of this tree in centimeters?
一根绳子长13.56米，可以绕一棵树的树干10圈还剩1米，这棵树树干横截面的直径大约是多少厘米？
<gadget id="calculator">13.56 - 1</gadget>
<output>12.56</output>

<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>