How many square meters does a circular fountain with a perimeter of 37.2m cover? (π takes 3.1)
周长是37.2m的圆形喷水池，占地面积是多少平方米？(π取3.1)
<gadget id="calculator">37.2 / 3.1 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.1 * 36</gadget>
<output>111.6</output>

<result>111.6</result>