A square swimming pool takes 200 meters to walk around, so what is the area of the swimming pool in square meters?
一个正方形的游泳池，走一圈是200米，那么这个游泳池的面积是多少平方米？
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

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

<result>2_500</result>