The length of the minute hand of an alarm clock is 3 cm. What is the distance traveled by the tip of the minute hand in 45 minutes?
一个闹钟，分针长3cm，45分钟分针尖端走过的路程是多少cm．
<gadget id="calculator">45 / 60</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 2 * 3 * (3/4)</gadget>
<output>14.13</output>

<result>14.13</result>