The minute hand of a wall clock is 10 cm long. What is the distance traveled by the tip of the minute hand in 1 hour?
一只挂钟的分针长10cm，经过1小时，分针的尖端走的路是多少．
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<result>62.8</result>