Cut out the largest square from a rectangular paper with a length of 9 cm and a width of 6 cm. What is the area of the remaining part in square centimeters?
从一个长9厘米，宽6厘米的长方形纸上剪下一个最大的正方形，剩下部分的面积是多少平方厘米．
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">54 - 36</gadget>
<output>18</output>

<result>18</result>