A piece of rectangular paper is 36cm long and 24cm wide. Now we need to divide this rectangular paper into several squares of the same size. What is the maximum side length of the square in cm?
一张长方形纸长36cm，宽24cm，现在要把这个长方形纸分成若干个大小相同的正方形，正方形的边长最大是几cm？
<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

<result>12</result>