The perimeter of a cross-section of a piece of wood is 25.12 cm, what is the area of its cross-section in square centimeters?
一根木头横截面的周长是25.12厘米，它的横截面的面积是多少平方厘米？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">25.12 / 6.28</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>