In a square with an area of 8 square decimeters, draw the largest circle, what is the area of the circle in square decimeters?
在1个面积是8平方分米的正方形中，画1个最大的圆，圆的面积是多少平方分米？
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>