Xiaoqiang walked 4 times around a square artificial lake, a total of 800 meters. What is the area of the artificial lake in square meters?
小强围着一个正方形的人工湖走了4圈，一共走了800米．这个人工湖的面积是多少平方米？
<gadget id="calculator">800 / 4 / 4</gadget>
<output>50</output>

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

<result>2_500</result>