Cut a square with the largest area from a rectangular cardboard with a length of 6 cm and a width of 4 cm. What is the area of this square in square centimeters?
在一个长是6厘米，宽是4厘米的长方形纸板上剪一个面积最大的正方形，这个正方形的面积是多少平方厘米？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>