Uncle Wang uses a wall to surround a rectangle with a 24-meter rope. What is the maximum area of this rectangle in square meters?
王大伯利用一面墙，用24米的绳子围一个长方形，这个长方形的面积最大是多少平方米．
<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>