Cut out two largest squares on a rectangular paper with a length of 7 cm and a width of 3 cm. What is the sum of the areas of these two squares?
在长7厘米、宽3厘米的长方形纸上，剪下两个最大的正方形，这两个正方形的面积和是多少平方厘米．
<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<result>18</result>