A flower bed has a diameter of 5 meters. Xiaogang walked around it 10 times. How many meters did he walk?
一个花坛，直径5米，小刚在周围走了10圈，他走了多少米？
<gadget id="calculator">3.14 * 5 * 10</gadget>
<output>157</output>

<result>157</result>