If a cube with side length 40 cm is cut into two identical cuboids, what is the surface area of each cuboid?
将棱长40厘米的正方体截成两个完全一样的长方体，每个长方体的表面积是多少平方厘米．
<gadget id="calculator">40 * 40</gadget>
<output>1_600</output>

<gadget id="calculator">40 * 20</gadget>
<output>800</output>

<gadget id="calculator">1_600 + 800 + 800</gadget>
<output>3_200</output>

<gadget id="calculator">3_200 * 2</gadget>
<output>6_400</output>

<result>6_400</result>