The minute hand of a big clock is 40 cm long, how many centimeters does the tip of the minute hand travel after 1 hour?
一只大钟的分针长40cm，经过1小时后，分针的针尖走了多少厘米？
<gadget id="calculator">3.14 * 40 * 2</gadget>
<output>251.2</output>

<result>251.2</result>