If a cuboid with a length of 5 cm, a width of 4 cm and a height of 2 cm is cut into two identical cuboids with the same length and height, how much does the surface area increase in c㎡?
把一个长5cm、宽4cm、高2cm的长方体，切成长和高不变的两个完全相同的长方体后，表面积增加了多少c㎡
<gadget id="calculator">5 * 2 * 2</gadget>
<output>20</output>

<result>20</result>