The distance between the two feet of the compass is 6cm. What is the circumference of the circle drawn with this compass?
圆规两脚分开的距离是6cm，用这个圆规画出的圆，它的周长是多少．
<gadget id="calculator">3.14 * 6 * 2</gadget>
<output>37.68</output>

<result>37.68</result>