If a cube with an edge length of 3 cm is cut into two identical cuboids, how much will the surface area increase in cm**2.
棱长是3厘米的正方体，切割成两个相同的长方体，表面积增加多少cm**2．
<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<result>18</result>