An hour hand is 3 cm long, what is the distance traveled by the tip of the hour hand after a day and night?
一根时针长3cm，经过一昼夜，时针针尖走过的路程是多少？
<gadget id="calculator">2 * 3.14 * 3 * 2</gadget>
<output>37.68</output>

<result>37.68</result>