The hour hand of a clock is 4 cm long, how many centimeters does the tip of the hour hand travel in one day and night? (Note: One day and one night, the hour hand moves 2 times)
一个钟的时针长4厘米，这个时针的尖端转动一昼夜所走的路程是多少厘米？(注意：一昼夜，时针则走2圈)
<gadget id="calculator">3.14 * 4 * 2 * 2</gadget>
<output>50.24</output>

<result>50.24</result>