Xiaohua measured the circumference of a tree trunk to be 125.6cm. What is the cross-sectional area of the trunk in cm**2 (take 3.14 for π)
小华测得一棵树树干的周长是125.6cm．这棵树干的横截面积是多少cm**2(π取3.14)
<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<result>1_256</result>