If a rope with a length of 125.6 meters is used to form a plane figure, what is the maximum area of this figure in square centimeters?
用一根长是125.6米的绳子围成一个平面图形，这个图形的面积最大是多少平方厘米？
<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 100</gadget>
<output>125_600</output>

<result>125_600</result>