Cut the largest circle out of a square with a side length of 6 cm, what is the area of the remaining part?
在一个边长是6cm的正方形中剪下一个最大的圆，剩下部分的面积是多少．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">36 - 28.26</gadget>
<output>7.74</output>

<result>7.74</result>