To make a cube iron box without a cover with a side length of 6 decimeters, what is the minimum area of the iron sheet?
做一个棱长为6分米的无盖的正方体铁盒，至少要多大面积的铁皮？
<gadget id="calculator">6 * 6 * 5</gadget>
<output>180</output>

<result>180</result>