Draw the largest circle in a rectangle with a width of 10 cm and a width of 6 cm. What is the circumference of this circle in cm?
在一个10厘米、宽6厘米的长方形中画一个最大的圆，这个圆的周长是多少厘米．
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<result>18.84</result>