A piece of iron wire is 24 cm long, if it is surrounded by a rectangle or a square whose side length is an integer number of centimeters, what is the maximum area in square centimeters?
一根铁丝长24厘米，如果把它围成边长是整厘米数的长方形或正方形，面积最大是多少平方厘米．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

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

<result>36</result>