The minute hand of a clock is 9 cm long, how many centimeters does the tip of the minute hand travel in one revolution?
一个时钟的分针长9cm，这根分针的尖端转动一周所走的路程是多少厘米？
<gadget id="calculator">3.14 * 2 * 9</gadget>
<output>56.52</output>

<result>56.52</result>