It is known that the minute hand moves for 45 minutes and the length of the minute hand is 3 cm. What is the distance traveled by the minute hand at this time?
已知分针走45分钟，分针长3厘米，这时分针所走过的路程是多少厘米
<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>