The minute hand of a clock is 6 cm long, how many centimeters does it travel in 2 revolutions?
一台时钟的分针长6厘米，它走过2圈走了多少厘米．
<gadget id="calculator">3.14 * 6 * 2 * 2</gadget>
<output>75.36</output>

<result>75.36</result>