The minute hand of a clock is 10 cm long. How many cm does the minute hand travel from 2 o'clock to 4 o'clock?
一个钟表的分针长10cm，从2时走到4时，分针走过了多少cm．
<gadget id="calculator">2 * 3.14 * 10 * 2</gadget>
<output>125.6</output>

<result>125.6</result>