There are 4 identical rectangular concrete columns in the auditorium, the length and width are 0.5 meters, and the height of the columns is 3.6 meters. If the paint is painted, how many square meters are the painted areas?
礼堂里有4根同样的长方体水泥柱，长和宽都是0.5米，柱高3.6米，如果刷油漆，那么刷油漆的面积一共有多少平方米？
<gadget id="calculator">0.5 * 3.6 * 4 * 4</gadget>
<output>28.8</output>

<result>28.8</result>