Draw the largest circle in a square with an area of 4m**2, what is the approximate area of this circle in square meters?
在一个面积是4m**2的正方形中画一个最大的圆，这个圆的面积约是多少平方米．
<gadget id="calculator">4 / 4</gadget>
<output>1</output>

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

<result>3.14</result>