The side length of the square is 4cm, the diameter of the circle is 4cm, how much is the area of the square larger than the area of the circle in cm**2.
正方形的边长4cm，圆的直径为4cm，正方形的面积比圆的面积大多少cm**2．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">16 - 12.56</gadget>
<output>3.44</output>

<result>3.44</result>