A circular ornamental fish pond has a circumference of 251.2 meters. How many square meters does this fish pond occupy?
一个圆形观赏鱼池，周长是251.2米，这个鱼池的占地面积是多少平方米？
<gadget id="calculator">251.2 / 3.14 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 ** 2</gadget>
<output>1_600</output>

<gadget id="calculator">3.14 * 1_600</gadget>
<output>5_024</output>

<result>5_024</result>