Fanghua District 2 is built on a square land. Xiao Ming walked around the community for a total of 400 meters. What is the area of the community?
芳华2区建立在一块正方形土地上，小明绕着小区走了一圈共400米，那小区的面积是多少？
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>

<result>10_000</result>