The minute hand of the large clock on the roof of the Xi’an Telegraph Building is 2 meters long. From 8 am to 12 noon, how many meters has the tip of the minute hand traveled?
西安电报大楼楼顶的大钟表分针长2m，从上午8时到中午12时，分针针尖走过了多少米？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 2 * 2 * 4</gadget>
<output>50.24</output>

<result>50.24</result>