The school has a circular flower bed with a circumference of 18.84 meters. What is the area of the flower bed?
学校有个圆形花坛，周长是18.84米，花坛的面积是多少？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">18.84 / 6.28</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>