The diameter of the circular turntable at the crossroads is 40m, how many meters is it to go around the turntable once?
十字路口的圆形形转盘直径是40m，沿转盘转一周是多少米？
<gadget id="calculator">3.14 * 40</gadget>
<output>125.6</output>

<result>125.6</result>