The minute hand of a clock is 10 cm long, how many cm does the minute hand travel from 1 o'clock to 2 o'clock.
一个钟表的分针长10cm，从1时走到2时，分针走过了多少cm．
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<result>62.8</result>