If a rectangle with a length of 9 meters and a width of 6 meters is cut into the largest square, what is the area of the square?
一个长9米，宽6米的长方形，剪成一个最大的正方形，正方形的面积是多少．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>