The hour hand of a wall clock is 5 centimeters long, how many centimeters does its tip move in a day and night.
一个挂钟时针长5厘米，它的尖端一昼夜走了多少厘米．
<gadget id="calculator">3.14 * 5 * 2 * 2</gadget>
<output>62.8</output>

<result>62.8</result>