There are four rectangular pillars in the auditorium, the bottom is square, the side length of the bottom is 5dm, and the height is 5m. How many square decimeters do these four pillars cover?
礼堂有四根长方形状的柱子，底面是正方形，底面边长5dm，高5m．这四根柱子占地面积是多少平方分米？
<gadget id="calculator">5 * 5 * 4</gadget>
<output>100</output>

<result>100</result>