A cuboid with a length of 18cm, a width of 12cm and a height of 5cm is cut to make two identical cuboids with the largest cut surface. What is the cut surface in cm**2.
一个长18cm，宽12cm，高5cm的长方体，切一刀，使它成为两个完全一样的长方体，并且切面最大，切面是多少cm**2．
<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<result>216</result>