Cut off the largest square on one side of a rectangular paper with a length of 60 cm and a width of 36 cm, and then cut a largest square on one side of the remaining rectangular paper, ..., continue to cut in this way until What is the area of the square until the last square is left?
在一张长60厘米，宽36厘米的长方形纸的一边剪去一个最大的正方形，再在剩下的长方形纸的一边剪去一个最大的正方形，…，按这样的方法继续剪下去，剪到最后剩下一个正方形为止，这个正方形的面积是多少平方厘米．
<gadget id="calculator">60 - 36</gadget>
<output>24</output>

<gadget id="calculator">36 - 24</gadget>
<output>12</output>

<gadget id="calculator">24 - 12</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>