What is the area of the largest rectangle surrounded by various rectangles with 22 cm long iron wire? (both length and width are integers)
用长22厘米的铁丝围成各种长方形，围成的最大一个长方形的面积是多少？(长和宽都是整数)
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>