What is the remaining area of the largest circle drawn in a rectangle with a length of 6dm and a width of 4dm?
在一个长6dm，宽4dm的长方形中画一个最大的圆，其剩余面积是多少．
<gadget id="calculator">6 * 4</gadget>
<output>24</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">24 - 12.56</gadget>
<output>11.44</output>

<result>11.44</result>