The minute hand of a big clock on the roof of a certain hotel is 0.8 meters long, so how many meters does the tip of the minute hand travel from 12:00 noon to 3:00 pm?
某酒店楼顶的大钟，分针长0.8米，那么从中午12：00到下午3：00分针的钟尖走了多少米．
<gadget id="calculator">3.14 * 2 * 0.8 * 3</gadget>
<output>15.072</output>

<result>15.072</result>