A chicken farm uses a 36-meter fence, and one side is surrounded by a rectangular chicken farm. What is the maximum area of the chicken farm?
一养鸡场用一段36米的篱笆，一面靠墙围一个长方形养鸡场占地面积最大多少平方米．
<gadget id="calculator">18 * 9</gadget>
<output>162</output>

<result>162</result>