The perimeter of a cross-section of a piece of wood is 18.84 cm, what is the area of its cross-section in square centimeters?
一根木头横截面的周长为18.84厘米，它的横截面的面积为多少平方厘米？
<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>