In a clock, the length of the minute hand is 3 cm. From 1 o'clock to 2 o'clock, how many centimeters did the minute hand travel?
一个挂钟，分针针尖的长度是3厘米．从1时到2时，分针走过了多少厘米？
<gadget id="calculator">2 * 3.14 * 3</gadget>
<output>18.84</output>

<result>18.84</result>