Cut the largest circle in a square with a circumference of 8 decimeters, what is the circumference of the circle in decimeters?
在周长是8分米的正方形内剪一个最大的圆，圆的周长是多少分米．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>