Cut the largest circle out of a square with a side length of 8 cm. What is the circumference of the circle in cm?
在边长8厘米的正方形中剪下一个最大的圆，该圆的周长是多少厘米．
<gadget id="calculator">3.14 * 8</gadget>
<output>25.12</output>

<result>25.12</result>