Cut a rectangular paper towel with a length of 9 cm and a width of 6 cm into the largest square, what is the perimeter of this square in cm?
把一张长9厘米，宽6厘米的长方形纸巾，剪成一个最大的正方形，这个正方形的周长是多少厘米？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>