If the distance between the two legs of the compass is 1 cm, what is the circumference of the circle drawn?
圆规两脚间距离为1厘米，画出的圆的周长是多少厘米．
<gadget id="calculator">2 * 3.14 * 1</gadget>
<output>6.28</output>

<result>6.28</result>