The diameter of a circular flower bed is 5 meters. If you walk around the flower bed twice, how many meters will you walk in total?
一个圆形花坛的直径是5米，绕着花坛走了两圈，一共走了多少米？
<gadget id="calculator">3.14 * 5 * 2</gadget>
<output>31.4</output>

<result>31.4</result>