A circular vegetable field is surrounded by a fence with a length of 125.6 meters. What is the area of the vegetable field in square meters?
一块圆形菜地用篱笆围起来，篱笆长125.6米，菜地面积是多少平方米？
<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>