Cut out the largest circular surface from a square paper with an area of 36 square centimeters, what is the circumference of this circular surface in centimeters
在一个面积为36平方厘米的正方形纸上剪下一个最大的圆面，那么这个圆面的圆周长是多少厘米
<gadget id="calculator">3.14 * 3 * 2</gadget>
<output>18.84</output>

<result>18.84</result>