Dig a cuboid pool with a length of 5 meters, a width of 4 meters, and a depth of 2 meters. What is the minimum area of the pool in meters**2.
挖一个长5米，宽的4米，深2米的长方体水池，这个水池占地面积至少是多少米**2．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>