The minute hand of a wall clock is 20 cm long. What is the distance traveled by the tip of the minute hand after 1 hour?
一只挂钟的分针长20cm，经过1小时后，分针的尖端所走的路程是多少cm．
<gadget id="calculator">2 * 3.14 * 20</gadget>
<output>125.6</output>

<result>125.6</result>