The minute hand of a wall clock is 8 centimeters long, how many centimeters does its tip travel around?
一个挂钟分针长8厘米，它的尖端走了一圈是多少厘米．
<gadget id="calculator">2 * 3.14 * 8</gadget>
<output>50.24</output>

<result>50.24</result>