The minute hand of a clock is 10 cm long, how many centimeters does the tip of the needle travel in 1 hour?
时钟的分针长10厘米，在1小时内，针尖走过多少厘米．
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<result>62.8</result>