Xiaohong and Xiaodong can wrap a 12.56-meter-long rope exactly 10 times around the trunk of a tree. What is the approximate cross-section of the trunk of this tree in square meters?
小红和小东用一根长12.56米的绳子正好可以绕一棵树的树干10圈，这棵树的树干的横截面大约是多少平方米？
<gadget id="calculator">12.56 / 10 / 2 / 3.14</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 ** 2</gadget>
<output>0.04</output>

<gadget id="calculator">3.14 * 0.04</gadget>
<output>0.1256</output>

<result>0.1256</result>