If a square iron sheet with a circumference of 8 decimeters is processed into the largest circle, what is the area of this circle in square decimeters? (taken = 3.14)
把周长是8分米的正方形铁皮加工成一个最大的圆，这个圆的面积是多少平方分米．(取兀=3.14)
<gadget id="calculator">8 / 4 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>