The radius of a circular flower bed is 10 meters. Xiao Gang ran 5 times around the flower bed. How many meters did Xiao Gang run?
一个圆形花坛的半径是10米，小刚绕着花坛跑了5圈，小刚跑了多少米？
<gadget id="calculator">2 * 3.14 * 10 * 5</gadget>
<output>314</output>

<result>314</result>