The clock on the roof of a certain hotel has an hour hand that is 0.8 meters long. How many meters does the tip of the hour hand travel from 12:00 noon to 6:00 pm?
某酒店楼顶的大钟，时针长0.8米，那么从中午12：00到下午6：00，时针的针尖走了多少米？
<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">2 * 3.14 * 0.4</gadget>
<output>2.512</output>

<result>2.512</result>