A square field, each side is 200 meters long, how many meters does it take Xiaopang to walk around the field?
一块正方形场地，每条边长200米，小胖沿着这块场地走一圈，要走多少米？
<gadget id="calculator">200 * 4</gadget>
<output>800</output>

<result>800</result>