After a circular playground with a circumference of 502.4m is widened by 10m, how many square meters does the area increase?
把一个周长为502.4m的圆操场向外扩宽10m后，面积增加了多少平方米？
<gadget id="calculator">502.4 / 3.14 / 2</gadget>
<output>80</output>

<gadget id="calculator">80 + 10</gadget>
<output>90</output>

<gadget id="calculator">90 ** 2</gadget>
<output>8_100</output>

<gadget id="calculator">3.14 * 8_100</gadget>
<output>25_434</output>

<gadget id="calculator">80 ** 2</gadget>
<output>6_400</output>

<gadget id="calculator">3.14 * 6_400</gadget>
<output>20_096</output>

<gadget id="calculator">25_434 - 20_096</gadget>
<output>5_338</output>

<result>5_338</result>