A rectangular colored paper with a length of 15 cm and a width of 9 cm, cut out the largest square on this paper, what is the area of this square? how many centimeters
一个长15厘米，宽9厘米的长方形彩纸，在这张纸上剪下一个最大的正方形，这个正方形的面积是多少？多少厘米
<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>