The hour hand of a wall clock is 3 cm long, how many centimeters does the tip of the hour hand move in a day and night
一个挂钟的时针长3厘米，一昼夜这根时针的尖端走了多少厘米
<gadget id="calculator">3.14 * 3 * 2 * 2</gadget>
<output>37.68</output>

<result>37.68</result>