Cut out the largest square from a rectangular piece of paper with a length of 18 cm and a width of 10 cm. What is the area of the cut paper?
在一张长18厘米，宽10厘米的长方形纸片上剪下一个最大的正方形，剪去的纸片面积是多少．
<gadget id="calculator">18 * 10</gadget>
<output>180</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">180 - 100</gadget>
<output>80</output>

<result>80</result>