A circular green belt is built in the community, and a tree is planted every 4.71 meters around it. A total of 24 trees are planted. What is the area of the green belt?
小区建了一个圆形绿化带，周围每隔4.71米种一棵树，共种了24棵，则这个绿化带的面积是多少？
<gadget id="calculator">24 / 3.14 / 2</gadget>
<output>3.821656</output>

<gadget id="calculator">4.71 * 3.821656</gadget>
<output>18</output>

<gadget id="calculator">18 ** 2</gadget>
<output>324</output>

<gadget id="calculator">3.14 * 324</gadget>
<output>1_017.36</output>

<result>1_017.36</result>