In a clock, the minute hand is 5 cm long. How many centimeters does the tip of the minute hand travel in one revolution?
一个座钟，分针长5厘米．它旋转一周，分针尖端所行的路程是多少厘米？
<gadget id="calculator">3.14 * 5 * 2</gadget>
<output>31.4</output>

<result>31.4</result>