Think about it: Cut a rectangular piece of paper with a length of 18 cm and a width of 9 cm into two largest squares. What is the perimeter of each square?
想一想：把长18厘米、宽9厘米的长方形纸剪成两个最大的正方形，每个正方形的周长是多少？
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>