Uncle Wang used a fence to form a square sheepfold with a side length of 6.28 meters. Later, someone told him that the area of the circle was larger, so he used these fences to form a circular sheepfold as large as possible. How many square meters is the area of this circular sheepfold?
王大爷用篱笆围成一个边长为6.28米的正方形羊圈．后来有人告诉他围成的圆形面积更大一些，他就用这批篱笆改围成了一个尽可能大的圆形羊圈，这个圆形羊圈的面积是多少平方米？
<gadget id="calculator">6.28 * 4</gadget>
<output>25.12</output>

<gadget id="calculator">25.12 / 3.14 / 2</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>