The minute hand of a clock is 9 cm long, how many centimeters does the tip of the minute hand of this clock move after 12 hours?
一个时钟的分针长9厘米，经过12小时，这个时钟的分针尖端移动了多少厘米？
<gadget id="calculator">2 * 3.14 * 9 * 12</gadget>
<output>678.24</output>

<result>678.24</result>