A circular fish pond has a circumference of 314 meters. What is the area of the fish pond in square meters?
一个圆形鱼塘，周长314米，这个鱼塘的面积是多少平方米？
<gadget id="calculator">314 / 3.14 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">3.14 * 2_500</gadget>
<output>7_850</output>

<result>7_850</result>