Cut out the largest square from a rectangular piece of paper with a length of 15 cm and a width of 6 cm. What is the area of the remaining figure in square centimeters?
从一张长15厘米，宽6厘米的长方形纸上剪下一个最大的正方形，剩下的图形面积是多少平方厘米？
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

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

<gadget id="calculator">90 - 36</gadget>
<output>54</output>

<result>54</result>