There is a rectangular piece of paper with a length of 120 cm and a width of 90 cm. Now it needs to be cut into several square pieces of paper of the same size, and there are no remaining pieces. What is the maximum area of the cut square pieces of paper?
有一个长方形的纸，长120厘米，宽90厘米，现在要剪成若干张同样大小的正方形纸片，且没有剩余，剪出的正方形纸片的面积最大是多少？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<result>900</result>