The minute hand of a quartz clock is 6 cm long. How many centimeters does the tip of the minute hand move in 1 hour?
一座石英钟的分针长6cm，经过1小时，分针的尖端移动了多少厘米．
<gadget id="calculator">3.14 * 2 * 6</gadget>
<output>37.68</output>

<result>37.68</result>