The minute hand of a wall clock is 5 cm long, how many centimeters does its tip travel around?
一个挂钟分针长5厘米，它的尖端走了一圈是多少厘米．
<gadget id="calculator">2 * 3.14 * 5</gadget>
<output>31.4</output>

<result>31.4</result>