Draw a circle with a compass. If the distance between the two feet of the compass is 6 cm, what is the circumference of the circle drawn?
用圆规画一个圆，如果圆规两脚之间的距离是6厘米，画出的这个圆的周长是多少厘米．
<gadget id="calculator">3.14 * 2 * 6</gadget>
<output>37.68</output>

<result>37.68</result>