There is a circular flower bed surrounded by nursing railings. The railing is 62.8 meters long. What is the area of this flower bed?
有一个圆形的花坛，在它的边沿围上护理栏，栏杆长62.8米，这个花坛的面积是多少？
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>