If the length of the hour hand on the clock face is 1dm, what is the distance traveled in one day and night?
钟面上时针的长1dm，一昼夜走过的路程是多少．
<gadget id="calculator">3.14 * 1 * 2 * 2</gadget>
<output>12.56</output>

<result>12.56</result>