In a rectangle with a length of 12 cm and a width of 9 cm, cut out the largest square. What is the area of the square in cm**2.
在长12cm、宽9cm的长方形中，剪出一个最大的正方形，正方形的面积是多少cm**2．
<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>