Build a circular flower bed with a perimeter of 62.8 meters, how many square meters does this flower bed occupy?
建一个周长是62.8米的圆形花坛，求这个花坛占地多少平方米？
<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>