cuboid has a length of 4 meters, a width of 3 meters and a height of 5 meters. What is the maximum area in square meters?
一个长方体，长4米，宽3米，高5米，它的占地面积最大是多少平方米．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>