The circumference of the tree trunk measured by Wang Hao is 125.6 cm. What is the area of the cross section of this tree in square centimeters?
王浩测的树干的周长是125.6厘米，这棵树横截面的面积是多少平方厘米？
<gadget id="calculator">125.6 / 2 / 3.14</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>