A rope 12.56 meters long can wrap exactly 10 times around the trunk of a tree. What is the approximate diameter of the cross-section of the trunk of this tree?
一根长12.56米的绳子正好可以绕一棵树的树干10圈．这棵树树干的横截面的直径大约是多少米？
<gadget id="calculator">12.56 / 10 / 3.14</gadget>
<output>0.4</output>

<result>0.4</result>