The minute hand of a wall clock is 6 cm long. What is the distance traveled by the tip of the minute hand in 30 minutes?
一只挂钟的分针长6cm，经过30分钟，分针的尖端所走过的距离是多少厘米．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 6 * 1</gadget>
<output>18.84</output>

<result>18.84</result>