A square iron sheet with a side length of 8 decimeters is cut into the largest circle. How many decimeters is the circumference of the circle?
一张边长8分米的正方形铁皮，把它剪成一个最大的圆，圆的周长有多少分米．
<gadget id="calculator">3.14 * 8</gadget>
<output>25.12</output>

<result>25.12</result>