A square and a circle are respectively surrounded by a lead wire 12.56 decimeters long. How much is the area of the circle greater than the area of the square?
用12.56分米长的铅丝分别围成一个正方形和圆，圆的面积比正方形面积多多少？
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

<gadget id="calculator">12.56 / 3.14 / 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">3.14 * 3.14</gadget>
<output>9.8596</output>

<gadget id="calculator">12.56 - 9.8596</gadget>
<output>2.7004</output>

<result>2.7004</result>