A large clock has a minute hand 40 cm long. How many centimeters does the tip of the minute hand travel in one revolution?
一只大钟，它的分针长40厘米．这根分针的尖端转动一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>