There is a circular children's swimming pool with a bottom circumference of 62.8 meters. What is its floor area?
有一个圆形儿童游泳池底面周长62.8米，它的占地面积是多少？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">62.8 / 6.28</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>