There is a circular musical fountain in front of the children's amusement park. The circumference is 47.1 meters. How many square meters does it cover?
儿童游乐园门前有个圆形音乐喷泉，周长是47.1米，它的占地面积是多少平方米？
<gadget id="calculator">47.1 / 3.14 / 2</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 ** 2</gadget>
<output>56.25</output>

<gadget id="calculator">3.14 * 56.25</gadget>
<output>176.625</output>

<result>176.625</result>