Xiao Gang walked around a circular stadium at a speed of 62.8 meters per minute, which took exactly 5 minutes. What is the area of the stadium in square meters?
小刚以每分钟62.8米的速度绕一个圆形体育场步行一周，恰好用了5分钟．这个体育场的面积是多少平方米？
<gadget id="calculator">62.8 * 5</gadget>
<output>314</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">314 / 6.28</gadget>
<output>50</output>

<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">3.14 * 2_500</gadget>
<output>7_850</output>

<result>7_850</result>