A cuboid iron box with a square bottom, if you unfold its sides, you will get a square with a side length of 40 cm. 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，正好得到一个边长是40厘米的正方形，这个铁箱的容积是多少
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 10 * 40</gadget>
<output>4_000</output>

<result>4_000</result>