A cuboid iron box with a square base. If it is unfolded on its side, a square with a side length of 12 decimeters is just obtained, what is the volume of the iron box?
一个底面是正方形的长方体铁箱．如果把它的侧面展开，正好得到一个边长为12分米的正方形，求铁箱的容积？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 12</gadget>
<output>108</output>

<result>108</result>