38cm iron wire is used to form a rectangle, the length and width of which are whole centimeters, what is the largest square centimeter of the area of the rectangle?
用38cm铁丝围成一个长方形，长和宽都是整厘米数，围成的长方形面积最大是多少平方厘米？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<result>80</result>