Use bamboo fences on three sides and a wall on one side to form a rectangular chicken coop. It is known that the length of the bamboo fence is 24 meters. What is the maximum area of the enclosed figure in square meters?
三面用竹篱笆，一面是墙，围成一个长方形鸡舍，已知竹篱笆长24米，围成的图形的面积最大是多少平方米？
<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">2 * 6 * 6</gadget>
<output>72</output>

<result>72</result>