To fringe a round fan, use a strip of cloth 18.84 cm long. What is the area of the fan in square centimeters?
给一把圆形的扇子镶边，共用去18.84厘米长的布条，这把扇子的面积是多少平方厘米？
<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>