The minute hand of a clock is 10 cm long, how many cm does the tip of the minute hand travel from 2 o'clock to 3 o'clock.
一个钟表的分针长10cm，从2时到3时，分针尖端走过了多少cm．
<gadget id="calculator">2 * 3.14 * 10</gadget>
<output>62.8</output>

<result>62.8</result>