In a rectangle with a length of 8 cm and a width of 6 cm, draw the largest circle, what is the circumference of this circle in cm?
在长8cm，宽6cm的长方形中，画一个最大的圆，这个圆的周长是多少cm．
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<result>18.84</result>