There is a square lawn with a side length of 20 meters. There is a small road along it. Xiaohong ran four times along the small road, about how many meters she ran.
一块正方形草坪，边长是20米，沿它四周有一条小路，小红沿小路跑了四圈，大约跑了多少米．
<gadget id="calculator">20 * 4 * 4</gadget>
<output>320</output>

<result>320</result>