A square sheet of iron is cut into a rectangle with a width of 3 cm, and the remaining area is 54 cm2. Find the area of the cut sheet.
一张正方形铁皮，剪下3厘米宽的长方形，剩下的面积是54平方厘米．求剪下铁皮的面积．
<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>