A nearly circular runway has a radius of 5 meters. Xiao Ming ran 4 laps around the runway. How many meters did he run in total?
一个近似圆形的跑道，半径是5米，小明绕跑道跑了4圈，一共跑了多少米？
<gadget id="calculator">3.14 * 5 * 2 * 4</gadget>
<output>125.6</output>

<result>125.6</result>