There is a big clock hanging in the lobby of the hotel. Its minute hand is 40 cm long. How many centimeters does the tip of the minute hand travel around?
饭店的大厅内挂着一只大钟，它的分针长40厘米，这根分针的尖端转动四周所走的路程是多少厘米？
<gadget id="calculator">2 * 3.14 * 40</gadget>
<output>251.2</output>

<result>251.2</result>