The cross-sectional area of a pole cuboid is 0.4 square decimeters. After cutting into two cuboids, how many square decimeters will the surface area increase?
一极长方体的焚，横截面的面积是0.4平方分米，截成两根长方体木料后，表面积增加多少平方分米．
<gadget id="calculator">0.4 * 2</gadget>
<output>0.8</output>

<result>0.8</result>