A cube iron box with a side length of 2.5dm should be sprayed with a layer of paint on its outside. What is the area of the painted part?
一个正方体铁盒，棱长2.5dm，要在它的外面喷上一层油漆．喷漆部分的面积是多少平方分米？
<gadget id="calculator">2.5 * 2.5 * 6</gadget>
<output>37.5</output>

<result>37.5</result>